Curriculum Vitae of
 DUMITRU MOTREANU
 Department of Mathematics
University of Perpignan
66860 Perpignan, France
E-mail: motreanu@univ-perp.fr




 
Research Interests:
 
  1. Nonlinear Analysis:
    Variational Principles, Critical Point Theory,
    Variational and Hemivariational Inequalities,
    Non-Convex Optimization, Differential Topology;
  2. Partial Differential Equations :
    Nonlinear Elliptic Boundary Value Problems,
    Flow-Invariance, Phase-Field Systems;
  3. Applied Mathematics:
    Geometric Control Theory,
    Non-Smooth Mechanics,
    Dynamical Systems.

Educational History:
 

  1. Ph.D. of Mathematics, "Al. I. Cuza" University, Iasi, Romania, 1978,
    Dissertation:  Methods of Differential Topology with Application to the Cohomology of Differential Manifolds.
  2. Diploma in Mathematics, "Al. I. Cuza" University, Iasi, Romania, 1972.
Employment History:
 


  1. Professor, Department of Mathematics, University of Perpignan, France, 2000 - present.
  2. Professor, Department of Mathematics, University of Iasi,  Romania, 1996 - 2000.
  3. Associate Professor, Department of Mathematics, University of Iasi, Romania, 1990-1996.
  4. Lecturer, Department of Mathematics, University of Iasi, Romania, 1978-1990.
  5. Assistant Professor, Department of Mathematics, Technical University of Iasi, Romania, 1972-1978.
Award:
 


- "Simion Stoilov" Award of Romanian Academy, Bucharest, Romania, 1991.


Editorials
:
 

- Associate editor for the following international Journals of Mathematics:

  1. Abstract and Applied Analysis
  2. Advances in Nonlinear Analysis and Applications
  3. AIMS Mathematics
  4. Applicable Analysis
  5. Asian-European Journal of Mathematics
  6. Boundary Value Problems
  7. Demonstratio Mathematica (member of Editorial Advisory Board)
  8. Discrete and Continuous Dynamical Systems - Series S
  9. IAENG International Journal of Applied Mathematics
  10. International Journal of Applied Mathematics
  11. International Journal of Differential Equations and Applications
  12. Journal of Advanced Research in Differential Equations
  13. Journal of Function Spaces
  14. Journal of Global Optimization (until October 2016)
  15. Journal of Informatics and Mathematical Sciences
  16. Journal of Modern Mathematics Frontier
  17. Mathematics Applied in Science and Technology
  18. Minimax Theory and its Applications
  19. Nonlinear Analysis (until May 2020)
  20. Numerical Functional Analysis and Optimization
  21. PanAmerican Mathematical Journal

Editorial Works
:
 

- ``Handbook of Nonconvex Analysis and Applications'', Edited by David Yang Gao and Dumitru Motreanu, International Press of Boston, Sommerville, USA, 2010.

- Applicable Analysis, Volume 89, Number 2, February 2010, Special Issue: Nonsmooth Variational Problems (Guest Editors: Siegfried Carl, Robert P. Gilbert and Dumitru Motreanu).

- Discrete and Continuous Dynamical Systems, 2011, Special Issue ``Variational Methods in Nonlinear Elliptic Equations'' (Guest Editors: Siegfried Carl, Salvatore A. Marano and Dumitru Motreanu).

- Boundary Value Problems, 2014, Special Issue ``Recent Advances in Boundary Value Problems'' (Guest Editors: Ravi P. Agarwal and Dumitru Motreanu).

Reviewer:
 


  1. Mathematical Reviews;
  2. Zentralblatt fur Mathematik.


Visiting Positions Held
:
 
  1. Martin-Luther-Universität Halle-Wittenberg, Halle, Germany (March 1-9, 2010);

  2. Universidade Federal de Juiz de Fora, Brazil (April 1- 30, 2012);

  3. Institute of Mathematics of Czech Academy, Prague, Czech Republic (February 18- 29, 2012);

  4. Rochester Institute of Technology, Rochester, U.S.A. (August 27- September 2, 2011);

  5. Institute of Mathematics of Czech Academy, Prague, Czech Republic (February 13- 20, 2011);

  6. University of Reggio Calabria, Italy (December 7-December 16, 2010);

  7. Guangxi University for Nationalities, Nanning, China (October 17-October 28, 2010);

  8. Martin-Luther-Universität Halle-Wittenberg, Halle, Germany (May 29-June 5, 2010);

  9. University of Reggio Calabria, Reggio Calabria, Italy (October 2-15, 2009);

  10. Martin-Luther-Universität Halle-Wittenberg, Halle, Germany (July 11-18, 2009);

  11. Academy of Mathematics and Systems Science, Chinese Academy of Sciences, Beijing, China (June 8-June 14, 2009);

  12. University of Prague, Czech Republic (October 1- 10, 2008);

  13. Martin-Luther-Universität Halle-Wittenberg, Halle, Germany (2005, 2006, October 27 - November 3, 2007);

  14. Missouri-Rolla University, Rolla, U.S.A. (2005);

  15. Mathematisches Forschungsinstitut Oberwolfach, Germany (2003);

  16. Royal Military College of Canada, Kingston, Canada (2003);

  17. University of Prague, Czech Republic (2000, 2001);

  18. University of Limoges, France (2000);

  19. University of Perpignan, France (1999);

  20. University of  Warsaw, Poland (1999);

  21. University of Catania, Italy (1998, 1999);

  22. University of La Reunion, France (1998);

  23. Ohio University, Athens, U.S.A. (1997, 2001);

  24. University of  Namur, Belgium (1996);

  25. University of Trento, Italy (1995, 1996);

  26. University of  Pau, France (1994);

  27. University of Thessaloniki, Greece (1993-1995);

  28. University of Lublin, Poland (1991);

  29. University of Freiburg, Germany (1984).

  Publications:
      

 
I. Books Authored:

  1. D. Motreanu,
    Nonlinear differential problems with smooth and nonsmooth constraints
    ,
    Mathematical Analysis and Its Applications, Elsevier/Academic Press, Amsterdam, 2018, xvi+345 pp.
  2. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou,
    Topological and Variational Methods with Applications to Nonlinear Boundary Value Problems
    ,
    Springer, New York, 2014, 459 pp.
  3. S. Carl, V. K. Le and D. Motreanu,
    Nonsmooth Variational Problems and Their Inequalities. Comparison Principles and Applications
    ,
    Springer Monographs in Mathematics, Springer, New York, 2007, 410 pp.
  4. D. Goeleven, D. Motreanu, Y. Dumont and M. Rochdi,
    Variational and Hemivariational Inequalities, Theory, Methods  and Applications
    ,
    Volume I:  Unilateral Analysis and Unilateral Mechanics, Kluwer Academic Publishers, Dordrecht / Boston / London, 2003, 424pp.
  5. D. Goeleven and D. Motreanu, 
    Variational
    and Hemivariational Inequalities, Theory, Methods and Applications,
     Volume II: Unilateral Problems, Kluwer Academic Publishers, Dordrecht / Boston / London, 2003, 368pp.
  6. D. Motreanu and V. Radulescu,
    Variational and Non-variational Methods in Nonlinear Analysis and Boundary Value Problems,

    Kluwer Academic Publishers, Dordrecht / Boston / London, 2003, 388 pp.
  7. D. Motreanu and N. H. Pavel,
    Tangency,   Flow-Invariance for Differential Equations  and Optimization Problems
    ,
    Marcel Dekker, Inc., New York, Basel, 1999, x+479pp.
  8. D. Motreanu and P. D. Panagiotopoulos,
     Minimax Theorems and Qualitative Properties of the  Solutions of Hemivariational Inequalities, Kluwer Academic Publishers, Dordrecht / Boston / London, 1999, xviii+309pp
 


II. Papers in Refereed Journals

  1. D. Motreanu and E. Tornatore, Dirichlet problems with anisotropic principal part involving unbounded coefficients, Electron. J. Differential Equations 2024, Paper No. 11, 13 pp.

  2. D. Motreanu, Hemivariational inequalities with competing operators, Commun. Nonlinear Sci. Numer. Simul. 130 (2024), Paper No. 107741.

  3. M. Galewski and D. Motreanu, On variational competing (p,q)-Laplacian Dirichlet problem with gradient depending weight, Appl. Math. Lett. 148 (2024), Paper No. 108881.

  4. L. Gambera, S. A. Marano, and D. Motreanu, Quasilinear Dirichlet systems with competing operators and convection, J. Math. Anal. Appl. 530 (2024) 127718.

  5. M. Galewski and D. Motreanu, On variational approach to fourth-order problems with unbounded weight, Math. Meth. Appl. Sci. 2023, 1–13.

  6. Z. Liu, D. Motreanu, and S. Zeng, Multiple solutions for a Kirchhoff-type problem with vanishing nonlocal term and Fractional p-Laplacian, Front. Math. 2023, 18(5): 1067–1082.

  7. D. Motreanu, Quasilinear differential inclusions driven by degenerated p-Laplacian with weight, Stud. Univ. Babes-Bolyai Math. 68 (2023), no. 1, 77--91.

  8. D. Motreanu, Nonhomogeneous Dirichlet problems with unbounded coefficient in the principal part the principal part, Axioms 20222022, 11 (2023), No. 12, 739.

  9. D. Motreanu, An approximation approach for solving degenerated quasilinear problems, Discrete Contin. Dyn. Syst. Ser. S 16 (2023), no. 1, 89–103.

  10. D. Motreanu and E. Tornatore, Nonhomogeneous degenerate quasilinear problems with convection, Nonlinear Anal. Real World Appl. 71 (2023), Paper No. 103800.

  11. S. Ghosh and D. Motreanu, Infinitely many large solutions to a variable order nonlocal singular equation, Fract. Calc. Appl. Anal. 25 (2022), no. 2, 822–839.

  12. S. Zeng, D. Motreanu, and A. Khan, Evolutionary Quasi-Variational-Hemivariational Inequalities I: Existence and Optimal Control, J. Optim. Theory Appl. 193 (2022), no. 1-3, 950–970.

  13. J. Cen, A. Khan, D. Motreanu, and S. Zhang, Inverse problems for generalized quasi-variational inequalities with application to elliptic mixed boundary value systems, Inverse Problems 38 (2022), no. 6, Paper No. 065006, 28 pp.

  14. D. Motreanu, Equations with s-fractional (p,q)-Laplacian and convolution, Minimax Theory Appl. 7 (2022), no. 1, 159–172.

  15. M. Z. Nashed and D. Motreanu, Degenerated (p,q)-Laplacian With Weights and Related Equations With Convection, Numer. Funct. Anal. Optim. 42 (2021), no. 15, 1757--1767.

  16. D. Motreanu and V. V. Motreanu, Nonstandard Dirichlet problems with competing (p,q)-Laplacian, convection, and convolution, Stud. Univ. Babes-Bolyai Math. 66 (2021), no. 1, 95–103.

  17. D. Motreanu, Constrained problems via sub-supersolution, Appl. Anal. Optim. 5 (2021), no. 2, 239–249.

  18. Z. Liu, D. Motreanu and S. Zeng, Generalized penalty and regularization method for differential variational-hemivariational inequalities, SIAM J. Optim. 31 (2021), no. 2, 1158–1183.

  19. D. Motreanu, C. Vetro and F. Vetro, The effects of convolution and gradient dependence on a parametric Dirichlet problem, Partial Differ. Equ. Appl. 1 (2020), no. 1, Paper No. 3.

  20. G. Marino and D. Motreanu, Existence and L-estimates for elliptic equations involving convolution, Comput. Math. Methods 2 (2020), no. 5, e1103, 15 pp.

  21. D. Motreanu, Quasilinear Dirichlet problems with competing operators and convection, Open Math. 18 (2020), no. 1, 1510–1517.

  22. Y. Liu, Z. Liu and D. Motreanu, Existence and approximated results of solutions for a class of nonlocal elliptic variational-hemivariational inequalities, Math. Methods Appl. Sci. 43 (2020), no. 17, 9543–9556.

  23. D. Motreanu, V.T. Nguyen and S. Zeng, Existence of solutions for implicit obstacle problems of fractional Laplacian type involving set-valued operators, J. Optim. Theory Appl. 187 (2020), no. 2, 391–407.

  24. U. Guarnotta, S.A. Marano and D. Motreanu, On a singular Robin problem with convection terms, Adv. Nonlinear Stud. 20 (2020), no. 4, 895–909.

  25. D. Motreanu and V.V. Motreanu, Non-variational elliptic equations involving (p,q)-Laplacian, convection and convolution, Pure Appl. Funct. Anal. 5 (2020), no. 5, 1205–1215.

  26. Y. Liu, Z. Liu and D. Motreanu, Differential inclusion problems with convolution and discontinuous nonlinearities, Evol. Equ. Control Theory 9 (2020), no. 4, 1057–1071.

  27. Z. Liu, R. Livrea, D. Motreanu and S. Zeng, Variational differential inclusions without ellipticity condition, Electron. J. Qual. Theory Differ. Equ. 2020, Paper No. 43, 17 pp.

  28. O.H. Miyagaki, D. Motreanu and F.R. Pereira, Multiple solutions for a fractional elliptic problem with critical growth, J. Differential Equations 269 (2020), no. 6, 5542-5572.

  29. D. Motreanu, A. Sciammetta and E. Tornatore, A sub-supersolution approach for Neumann boundary value problems with gradient dependence, Nonlinear Anal. Real World Appl. 54 (2020), 103096.

  30. Y. Bai, D. Motreanu and S. Zeng, Continuity results for parametric nonlinear singular Dirichlet problems, Adv. Nonlinear Anal. 9 (2020), no. 1, 372–387.

  31. D. Motreanu and Z. Peng, Doubly coupled systems of elliptic hemivariational inequalities: existence and location, Comput. Math. Appl. 77 (2019), no. 11, 3001–3009.

  32. L. Lu, Z. Liu and D. Motreanu, Existence results of semilinear differential variational inequalities without compactness, Optimization 68 (2019), no. 5, 1017–1035.

  33. D. Motreanu and P. Winkert, Existence and asymptotic properties for quasilinear elliptic equations with gradient dependence, Appl. Math. Lett. 95 (2019), 78–84.

  34. Z. Liu, S. Zeng and D. Motreanu, Positive solutions for nonlinear singular elliptic equations of p-Laplacian type with dependence on the gradient, Calc. Var. Partial Differential Equations 58 (2019), no. 1, Art. 28, 22 pp.

  35. D. Motreanu and Z. Peng, Doubly coupled systems of parabolic hemivariational inequalities: existence and extremal solutions, Nonlinear Anal. 181 (2019), 101–118.

  36. Z. Liu, S. Zeng and D. Motreanu, Partial differential hemivariational inequalities, Adv. Nonlinear Anal. 7 (2018), no. 4, 571–586.

  37. Z. Liu, D. Motreanu and S. Zeng, Nonlinear evolutionary systems driven by mixed variational inequalities and its applications, Nonlinear Anal. Real World Appl. 42 (2018), 409–421.

  38. Z. Liu, D. Motreanu and S. Zeng, Nonlinear evolutionary systems driven by quasi-hemivariational inequalities, Math. Methods Appl. Sci. 41 (2018), no. 3, 1214-1229.

  39. D. Motreanu, A. Moussaoui and D.S. Pereira, Multiple solutions for nonvariational quasilinear elliptic systems, Mediterr. J. Math. 15 (2018), no. 3, Art. 88, 14 pp.

  40. Z. Liu and D. Motreanu, Inclusion problems via subsolution-supersolution method with applications to hemivariational inequalities, Appl. Anal. 97 (2018), no. 8, 1454-1465.

  41. L. Gang, D. Motreanu, H. Wu and Q. Zhang, Multiple solutions with constant sign for a (p,q)-elliptic system Dirichlet problem with product nonlinear term, Bound. Value Probl. 2018, Paper No. 67, 16 pp.

  42. A.A. Khan and D. Motreanu, Inverse problems for quasi-variational inequalities, J. Global Optim. 70 (2018), no. 2, 401-411.

  43. Z. Liu, D. Motreanu and S. Zeng, On the well-posedness of differential mixed quasi-variational-inequalities, Topol. Methods Nonlinear Anal. 51 (2018), no. 1, 135-150.

  44. D. Motreanu, V. V. Motreanu and A. Moussaoui, Location of nodal solutions for quasilinear elliptic equations with gradient dependence, Discrete Contin. Dyn. Syst. Ser. S 11 (2018), no. 2, 293-307.

  45. D. Motreanu, C. Vetro and F. Vetro, Systems of quasilinear elliptic equations with dependence on the gradient via subsolution-supersolution method, Discrete Contin. Dyn. Syst. Ser. S 11 (2018), no. 2, 309-321.

  46. S. Carl and D. Motreanu, Extremal solutions for quasilinear parabolic systems in trapping regions, Pure Appl. Funct. Anal. 3 (2018), no. 1, 57-74.

  47. Z. Liu, S. Zeng and D. Motreanu, Partial differential hemivariational inequalities, Adv. Nonlinear Anal. 7 (2018), no. 4, 571–586.

  48. D. Motreanu and E. Tornatore, Location of solutions for quasi-linear elliptic equations with general gradient dependence, Electron. J. Qual. Theory Differ. Equ. 2017, Paper No. 87, 10 pp.

  49. D. Motreanu, K. Moussaoui and Z. Zhang, Positive solutions for singular elliptic systems with convection term, J. Fixed Point Theory Appl. 19 (2017), no. 3, 2165–2175.

  50. S. Carl and D. Motreanu, Extremal Solutions for Nonvariational Quasilinear Elliptic Systems via Expanding Trapping Regions , Monatshefte für Mathematik 182 (2017), 801–821.

  51. D. Motreanu and V. V. Motreanu, Generic existence of nondegenerate homoclinic solutions , Lobachevskii Journal of Mathematics 38 (2017), 322–329.

  52. D. Motreanu and M. Tanaka, Existence of positive solutions for nonlinear elliptic equations with convection terms , Nonlinear Analysis 152 (2017), 38–60.

  53. Z. D. Motreanu, C. Vetro and F. Vetro, A parametric Dirichlet problem for systems of quasilinear elliptic equations with gradient dependence , Numerical Functional Analysis and Optimization 37 (2016), 1551-1561.

  54. D. Averna, D. Motreanu and E. Tornatore, Existence and asymptotic properties for quasilinear elliptic equations with gradient dependence , Applied Mathematics Letters 61 (2016), 102-107.

  55. Q. Zhang and D. Motreanu, Existence and blow-up rate of large solutions of p(x)-Laplacian equations with large perturbation and gradient terms, Advances in Differential Equations 21 (2016), 699–-734.

  56. Z. Liu, S. Zeng and D. Motreanu, Evolutionary Problems Driven by Variational Inequalities, Journal of Differential Equations 260 (2016), 6787–-6799.

  57. D. Motreanu and M. Tanaka, On a positive solution for (p,q)-Laplace equation with indefinite weight, Minimax Theory and its Applications, Minimax Theory and its Applications 1 (2016), 1–20.

  58. G. Bonanno, P. Candito and D. Motreanu, A coincidence point theorem for sequentially continuous mappings, Journal of Mathematical Analysis and Applications 435 (2016), 606-615.

  59. A. Khan and D. Motreanu, Existence Theorems for Elliptic and Evolutionary Variational and Quasi-Variational Inequalities, J. Optim. Theory Appl. 167 (2015), 1136-1161.

  60. Z. Liu, X. Li and D. Motreanu, Approximate controllability for nonlinear evolution hemivariational inequalities in Hilbert spaces, SIAM Journal on Control and Optimization 53 (2015), 3228-3244

  61. F. Faraci, D. Motreanu and D. Puglisi, Positive solutions of quasi-linear elliptic equations with dependence on the gradient, Calc. Var. Partial Differential Equations 54 (2015), 525–538.

  62. S. Carl and D. Motreanu, Multiple solutions for elliptic systems via trapping regions and related nonsmooth potentials, Applicable Analysis 94 (2015), 1594–1613.

  63. V. Goldshtein, D. Motreanu and V. V. Motreanu, Non-homogeneous Dirichlet boundary value problems in weighted Sobolev spaces, Complex Variables and Elliptic Equations 60 (2015), 372–391.

  64. D. Motreanu and M. Tanaka, Multiple existence results of solutions for quasilinear elliptic equations with a nonlinearity depending on a parameter, Annali di Matematica Pura ed Applicata 193 (2014), 1255–-1282..

  65. L. F. O. Faria, O. H. Miyagaki and D. Motreanu, Comparison and positive solutions for problems with (p,q)-Laplacian and convection term, Proceedings of the Edinburgh Mathematical Society 57 (2014), 687–-698..

  66. D. Motreanu and A. Moussaoui, An existence result for a class of quasilinear singular competitive elliptic systems, Applied Mathematics Letters 38 (2014), 33-37.

  67. D. Motreanu and A. Moussaoui, A quasilinear singular elliptic system without cooperative structure, Acta Mathematica Scientia 34 (2014), 905-916 .

  68. G. Barletta, P. Candito and D. Motreanu, Constant sign and sign changing solutions for quasilinear elliptic equations with Neumann boundary condition, J. Convex Anal. 21 (2014), 53-66.

  69. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, Existence and nonexistence of positive solutions for parametric Neumann problems with $p$-Laplacian, Tohoku Mathematical Journal 66 (2014), 137-153.

  70. D. Motreanu and V. V. Motreanu, Elliptic problems with nonhomogeneous boundary condition and derivatives of nonlinear terms, Boundary Value Problems, 2014, 2014:6 doi:10.1186/1687-2770-2014-6.

  71. L. F. O. Faria, O. H. Miyagaki, D. Motreanu and M. Tanaka, Existence results for nonlinear elliptic equations with Leray–Lions operator and dependence on the gradient, Nonlinear Analysis 96 (2014), 154–166.

  72. S. A. Marano, D. Motreanu and D. Puglisi, Multiple solutions to a Dirichlet eigenvalue problem with p-Laplacian, Topological Methods in Nonlinear Analysis 42 (2013), 277–291.

  73. D. Motreanu and V. V. Motreanu, Coercivity Properties for sequences of lower semicontinuous functions on metric spaces, Abstract and Applied Analysis, Volume 2013, Article ID 268650.

  74. D. Motreanu and A. Moussaoui, Existence and boundedness of solutions for a singular cooperative quasilinear elliptic system, Complex Variables and Elliptic Equations (2013), DOI:10.1080/17476933.2012.744404.

  75. D. Motreanu, Solvability of an anisotropic hyperbolic problem, Dynamic Systems and Applications 22 (2013), 543-556.

  76. D. Motreanu and M. Tanaka, Generalized eigenvalue problems of nonhomogeneous elliptic operators and their application, Pacific Journal of Mathematics 265 (2013), no. 1, 151-184.

  77. A. Khan and D. Motreanu, Local minimizers versus X-local minimizers, Optimization Letters 7 (2013), no. 5, 1027–1033.

  78. G. Bonanno, D. Motreanu and P. Winkert, Boundary value problems with nonsmooth potential, constraints and parameteres, Dynamic Systems and Applications 22 (2013), 385-396.

  79. A. Iannizzotto, S. A. Marano and D. Motreanu, Positive, negative, and nodal solutions to elliptic differential inclusions depending on a parameter, Advanced Nonlinear Studies 13 (2013), 431–445.

  80. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, On resonant Neumann problems, Mathematische Annalen 354 (2012), 1117-1145.

  81. S. Miyajima, D. Motreanu and M. Tanaka, Multiple existence results of solutions for the Neumann problems via super- and sub-solutions, Journal of Functional Analysis, Journal of Functional Analysis 262 (2012), 1921–1953.

  82. D. Motreanu, Three solutions with precise sign properties for systems of quasilinear elliptic equations, Continuous and Discrete Dynamical Systems, Series S 5 (2012), 831 - 843.

  83. D. Motreanu and M. Tanaka, Existence of solutions for quasilinear elliptic equations with jumping nonlinearities under the Neumann boundary condition, Calculus of Variations and Partial Differential Equations 43 (2012), 231-264.

  84. D. Motreanu, D.O'Regan and N. S. Papageorgiou, A unified treatment using critical point methods of the existence of multiple solutions for superlinear and sublinear Neumann problems, Communications on Pure and Applied Analysis 10 (2011), 1791 - 1816..

  85. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, Multiple constant sign and nodal solutions for nonlinear Neumann eigenvalue problems , Annali della Scuola Normale Superiore di Pisa, Classe di Scienze 10 (2011), 729-755.

  86. D. Motreanu and P. Winkert, On the Fucik spectrum for the p-Laplacianwith Robin boundary condition, Nonlinear Analysis 74 (2011), 4671-4681.

  87. P. Candito, R. Livrea and D. Motreanu, Bounded Palais-Smale sequences for non-diferentiable functions, Nonlinear Analysis 74 (2011), 5446-5454.

  88. D. Motreanu and N. S. Papageorgiou, Multiple solutions for nonlinear Neumann problems driven by a nonhomogeneous differential operator, Proceedings of the American Mathematical Society 139 (2011), 3527-3535.

  89. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, Nonautonomous resonant periodic systems with indefinite linear part and a nonsmooth potential, Communications in Pure and Applied Analysis 11 (2011), 1401-1414.

  90. G. Bonanno, D. Motreanu and P. Winkert, Variational-hemivariational inequalities with small perturbations of nonhomogeneous Neumann boundary conditions, Journal of Mathematical Analysis and Applications J. Math. Anal. Appl. 381 (2011) 627–637.

  91. D. Motreanu and Z. Zhang, Constant sign and sign changing solutions for systems of quasilinear elliptic equations, Set-Valued and Variational Analysis 19 (2011), 255–269.

  92. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, On p-Laplace equations with concave terms and asymmetric perturbations , Proceedings A of The Royal Society of Edinburgh 141A (2011), 171-192.

  93. D. Motreanu and P. Winkert, Variational-hemivariational inequalities with nonhomogeneous Neumann boundary condition, Le Matematiche Vol. LXV (2010), 109–119.

  94. D. Motreanu and M. Tanaka, Sign-changing and constant-sign solutions for $p$-Laplacian problems with jumping nonlinearities, Journal of Differential Equations 249 (2010), 3352-3376.

  95. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, Multiple solutions for resonant nonlinear periodic equations, Nonlinear Differential Equations and Applications 17 (2010), 535-557.

  96. S. Carl and D. Motreanu, Multiple and sign-changing solutions for the multivalued p-Laplacian equation , Mathematische Nachrichten 283 (2010), 965-981.

  97. Z. Liu and D. Motreanu, A class of variational-hemivariational inequalities of elliptic type , Nonlinearity 23 (2010), 1741-1752.

  98. D. Motreanu, V. V. Motreanu and M. Turinici, Corciveness property for conical nonsmooth functionals, Journal of Optimization Theory and Applications 145 (2010), 148-163.

  99. S. Carl and D. Motreanu, Sign-changing solutions for nonlinear elliptic problems depending on parameters, International Journal of Differential Equations, Volume 2010, 33 pages.

  100. S. Carl and D. Motreanu, Directedness of solution set for some quasilinear multi-valued parabolic problems, Applicable Analysis 89 (2010), 161-174.

  101. V. K. Le, D. Motreanu and V. V. Motreanu, On a nonsmooth eigenvalue problem in Orlicz-Sobolev spaces, Applicable Analysis 89 (2010), 229-242.

  102. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, Existence and multiplicity of solutions for asymptotically linear, noncoercive elliptic equations, Monatshefte fuer Mathematik 159 (2010), 59-80.

  103. D. Motreanu and K. Perera, Multiple nontrivial solutions for Neumann $p$-Laplacian systems, Topological Methods in Nonlinear Analysis 34 (2009), 41-48.

  104. D. Motreanu and N. Tarfulea, Quasilinear differential equations in exterior domains with nonlinear boundary conditions and application, Electronic Journal of Differential Equations Vol. 2009 (2009), No. 138, pp. 1-13.

  105. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, Multiple solutions for Dirichlet problems which are superlinear at + infinity and (sub)linear at - infinity, Communications in Applied Analysis 13 (2009), 341-358.

  106. V. K. Le and D. Motreanu, On nontrivial solutions of variational-hemivariational inequalities with slowly growing principal parts, Z. Anal. Anwend. 28 (2009), 277-293.

  107. S. Heidarkhani and D. Motreanu, Multiplicity results for a two-point boundary value problem, PanAmerican Mathematical Journal 19 (2009), 69-78.

  108. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, Nonlinear Neumann problems near resonance, Indiana University Mathamatics Journal 58 (2009), 1257-1280.

  109. S. A. Marano and D. Motreanu, Critical points of non-smooth functions with a weak compactness condition, Journal of Mathematical Analysis and Applications 358 (2009), 189-201.

  110. S. Carl and D. Motreanu, Comparison principle for quasilinear parabolic inclusions with Clarke's gradient, Advanced Nonlinear Studies 9 (2009), 69-80.

  111. O. Carja and D. Motreanu, Characterization of Lyapunov pairs in the nonlinear case and applications, Nonlinear Analysis TMA 70 (2009), 352-363.

  112. S. Carl and D. Motreanu, General comparison principle for quasilinear elliptic inclusions, Nonlinear Analysis TMA 70 (2009), 1105-1112.

  113. S. Carl and D. Motreanu, Multiple solutions of nonlinear elliptic hemivariational problems, Pacific Journal of Applied Mathematics 1 (2008), 39-59.

  114. P. Candito, R. Livrea and D. Motreanu, Z2-Symmetric critical point theorems for nondifferentiable functionals, Glasgow Mathematical Journal 50 (2008), 447-466.

  115. P. Jebelean, D. Motreanu and V. V. Motreanu, A unified approach for a class of problems involving a pseudo-monotone operator, Mathematische Nachrichten 281 (2008), 1283-1293.

  116. D. Averna, S. A. Marano and D. Motreanu, Multiple solutions for a Dirichlet problem with p-Laplacian, Bulletin of the Australian Mathematical Society 77 (2008), 285-303.

  117. S. Carl, V. K. Le and D. Motreanu, Evolutionary variational-hemivariational inequalities: existence and comparison results, Journal of Mathematical Analysis and its Applications 345 (2008), 545-558.

  118. S. Carl and D. Motreanu, Constant-sign and sign-changing solutions for nonlinear eigenvalue problems, Nonlinear Analysis 68 (2008), 2668-2676.

  119. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, Positive solutions and multiple solutions at non-resonance, resonance and near resonance for hemivariational inequalities with p-Laplacian, Transactions of the American Mathematical Society 360 (2008), 2527-2545.

  120. S.A. Marano, G. Molica Bisci and D. Motreanu, Multiple solutions for a class of elliptic hemivariational inequalities, Journal of Mathematical Analysis and Applications 337 (2008), 85-97.

  121. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, A multiplicity theorem for problems with the p-Laplacian, Nonlinear Analysis 68 (2008), 1016-1027.

  122. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, An unified approach for multiple constant sign and nodal solutions, Advances in Differential Equations 12 (2007), 1363-1392.

  123. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, A degree theoretic approach for multiple solutions of constant sign for nonlinear elliptic equations, Manuscripta Mathematica 124 (2007), 507-531.

  124. A. Kristaly and D. Motreanu, Nonsmooth Neumann-type problems involving the p-Laplacian, Numerical Functional Analysis and Optimization 28 (2007), 1309-1326.

  125. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, Multiple nontrivial solutions for nonlinear eigenvalue problems, Proceedings of the American Mathematical Society 135 (2007), 3649-3658.

  126. S. Carl and D. Motreanu, Constant-sign and sign-changing and extremal constant-sign solutions of nonlinear elliptic problems with supercritical nonlinearities, Communications on Applied Nonlinear Analysis 14 (2007), 85-100.

  127. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, Two nontrivial solutions for periodic systems with indefinite linear part, Discrete and Continuous Dynamical Systems 19 (2007), 197-210.

  128. S. Carl and D. Motreanu, Constant sign and sign-changing solutions of a nonlinear eigenvalue problem involving the p-Laplacian, Differential and Integral Equations 20 (2007), 309-324.

  129. D. Motreanu and N. S. Papageorgiou, Existence and multiplicity of solutions for Neumann problems, Journal of Differential Equations 232 (2007), 1-35.

  130. S. Carl and D. Motreanu, Quasilinear elliptic inclusions of Clarke's gradient type under local growth condition, Applicable Analysis 85 (2006), 1527-1540.

  131. O. Carja and D. Motreanu, Flow-invariance and Lyapunov pairs, Dynamics of Continuous, Discrete and Impulsive Systems Ser. A Math. Anal. 13B (2006), suppl., 185--198.

  132. G. Isac and D. Motreanu, A characterization of monotone nonlinear operators by pseudo-monotonicity, Nonlinear Analysis Forum 11 (2006), 61-66.

  133. V. K. Le and D. Motreanu, Some properties of general minimization problems with constraints, Set-Valued Analysis 14 (2006), 413-424.

  134. L. Gasinski, D. Motreanu and N. S. Papageorgiou, Multiplicity of nontrivial solutions for elliptic equations with nonsmooth potential and resonance at higher eigenvalues, Proceedings of Indian Academy of Sciences 116 (2006), 233-255.

  135. R. Livrea, S. Marano and D. Motreanu, Critical points for nondifferentiable functions in presence of splitting, Journal of Differential Equations 226 (2006), 704-725.

  136. D. Motreanu, Existence and location of solutions to some eigenvalue Dirichlet problems, An. St. Univ. Ovidius Constanta 13 (2005), 101-110.

  137. D. Motreanu, Parametric eigenvalue problems with constraints for variational-hemivariational inequalities, Nonlinear Analysis 63 (2005), 966-976.

  138. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, Existence of solutions for strongly nonlinear elliptic differential inclusions with unilateral constraints, Advances in Differential Equations 9 (2005), 961-982.

  139. D. Motreanu and V. Radulescu, Eigenvalue problems for degenerate nonlinear elliptic equations in anisotropic media, Boundary Value Problems 2 (2005) 107-127.

  140. S. Carl, V. K. Le and D. Motreanu, Existence, comparison and compactness results for quasilinear variational-hemivariational inequalities, International Journal of Mathematics and Mathematical Sciences 3 (2005), 401-417.

  141. P. Candito, S. Marano and D. Motreanu, Critical points for a class of non-differentiable functions and applications, Discrete and Continuous Dynamical Systems 13 (2005), 175-194.

  142. S. Carl, V. K. Le and D. Motreanu, Existence and comparison principles for general quasilinear variational-hemivariational inequalities, Journal of Mathematical Analysis and Applications 302 (2005), 65-83.

  143. D. Motreanu, A new approach in studying one parameter nonlinear eigenvalue problems with constraints, Nonlinear Analysis 60 (2005), 443-463.

  144. D. Motreanu, V. V. Motreanu and N. S. Papageorgiou, Periodic solutions for nonautonomous systems with nonsmooth quadratic and superquadratic potential, Topological Methods in Nonlinear Analysis 24 (2004), 269-296.

  145. D. Goeleven, D. Motreanu and V. V. Motreanu, On the study of a class of variational inequalities via Leray-Schauder degree, Fixed Point Theory and Applications 4 (2004), 261-271.

  146. D. Motreanu and V. V. Motreanu, Nonsmooth variational problems in the limit case and duality, Journal of Global Optimization 29 (2004), 439-453.

  147. S. Carl and D. Motreanu, Extremality in Solving General Quasilinear Parabolic Inclusions, Journal of Optimization Theory and Applications 123 (2004), 463-477.

  148. S. Marano and D. Motreanu, A critical point result for non-differentiable indefinite functionals, Commentationes Mathematicae Universitatis Carolinae 45 (2004), 663-679.

  149. S. Aizicovici, D. Motreanu and N. H. Pavel, Nonlinear Mathematical Programming and Optimal Control, Dynamics of Continuous, Discrete and Impulsive Systems 11 (2004), 503-524.

  150. S. T. Kyritsi, D. Motreanu and N. S. Papageorgiou, Two nontrivial solutions for strongly resonant nonlinear elliptic equations, Archiv der Mathematik (Basel) 83 (2004), 60-69.

  151. G. Isac and D. Motreanu, Pseudomonotonicity and quasimonotonicity by translations versus monotonicity in Hilbert spaces, Australian Journal of Mathematical Analysis and Applications 1 (2004), 1-8.

  152. S. Carl, V. K. Le and D. Motreanu, Existence and comparison results for quasilinear evolution hemivariational inequalities, Electronic Journal of Differential Equations 2004, N. 57, pp. 1-17.

  153. S. Carl, V. K. Le and D. Motreanu, The sub-supersolution method and extremal solutions for quasilinear hemivariational inequalities, Differential and Integral Equations 17 (2004), 165-178.

  154. D. Motreanu and N. S. Papageorgiou, Multiple solutions for nonlinear elliptic equations at resonance with nonsmooth potential, Nonlinear Analysis: Theory, Methods and Applications 56 (2004), 1211-1234.

  155. D. Motreanu, On the proof of a minimax principle, Le Matematiche 58 (2003), 95-99.

  156. G. Isac and D. Motreanu, On the solvability of complementarity problems and variational inequalities with integral operators, Journal of Nonlinear and Convex Analysis 4 (2003), 333-351.

  157. S. Marano and D. Motreanu, A deformation theorem and some critical point results for non-differentiable functions, Topological Methods in Nonlinear Analysis 22 (2003), 139-158.

  158. D. Motreanu and Z. Naniewicz, A minimax approach to semicoercive hemivariational inequalities, Optimization 52 (2003), 541-554.

  159. S. Carl and D. Motreanu, Quasilinear elliptic inclusions of hemivariational type: extremality and compactness of the solution set, Journal of Mathematical Analysis and Applications 286 (2003), 147-159.

  160. J. Haslinger and D. Motreanu, Hemivariational Inequalities with a general growth condition: Existence and Approximation, Applicable Analysis 82 (2003), 629-643.

  161. G. Dinca, P. Jebelean and D. Motreanu, Existence results for general inequality problems with constraints, Abstract and Applied Analysis 8 (2003), 601-619.

  162. C. Ciulcu, D. Motreanu and V. Radulescu, Multiplicity of solutions for a class of non-symmetric eigenvalue hemivariational inequalities, Mathematical Methods in the Applied Sciences 26 (2003), 801-814.

  163. S. Carl and D. Motreanu, Extremal solutions of quasilinear parabolic inclusions with generalized Clarke's gradient, Journal of Differential Equations 191 (2003), 206-233.

  164. D. Bainov, D. Kolev and D. Motreanu, A case of blow-up for a parabolic model with exponential boundary nonlinearity, Mathematical Sciences Research Journal 7 (2003), 1-7.

  165. D. Goeleven, D. Motreanu and V. V. Motreanu, On the stability of stationary solutions of first order evolution variational inequalities, Advances in Nonlinear Variational Inequalities 6 (2003), 1-30.

  166. S. Carl and D. Motreanu, Extremal solutions of quasilinear parabolic subdifferential inclusions, Differential and Integral Equations 16 (2003), 241-255.

  167. D. Bainov, D. Kolev and D. Motreanu, Blow-up of the solutions for an impulsive model with nonlinear boundary condition, PanAmerican Mathematical Journal 13 (2003), 67-81.

  168. C. Morosanu and D. Motreanu, An extension of Lie-Trotter product formula, Nonlinear Functional Analysis and Applications 7 (2002), 517-530.

  169. D. Bainov, D. Kolev and D. Motreanu, Barrier to existence of gradient blow-up for impulsive inviscid Burgers' equation, PanAmerican Mathematical Journal 12 (2002), 29-41.

  170. D. Motreanu, V. V. Motreanu and D. Pasca, A version of Zhong's coercivity result for a general class of nonsmooth functionals, Abstract and Applied Analysis 7 (2002), 601-612.

  171. D. Motreanu and Z. Naniewicz, Semilinear hemivariational inequalities with Dirichlet boundary condition, Advances in Mechanics and Mathematics, 2002, pp. 89-110.

  172. O. Chau, D. Motreanu and M. Sofonea,  Quasistatic frictional problems for elastic and viscoelastic materials, Applications of Mathematics 47 (2002), 341-360.

  173. G. Dinca, P. Jebelean and D. Motreanu, Existence and Approximation for a general class of differential inclusions, Houston Journal of Mathematics 28 (2002), 193-215.

  174. D. Motreanu, V. V. Motreanu and M. Turinici, Coerciveness property on quasi-ordered Banach spaces, Nonlinear Functional Analysis and Applications 7 (2002), 155-166.

  175. S. Marano and D. Motreanu, Infinitely many critical points of non-differentiable functions and applications to a Neumann type problem involving the p-Laplacian, Journal of Differential Equations 182 (2002), 108-120.

  176. S. Marano and D. Motreanu, On a three critical points theorem for non-differentiable functions and applications to nonlinear boundary value problems, Nonlinear Analysis TMA 48 (2002), 37-52.

  177. D. Motreanu, Eigenvalue problems for variational-hemivariational inequalities in the sense of P. D. Panagiotopoulos, Nonlinear Analysis TMA 47 (2001), 5101-5112.

  178. D. Bainov, D. Kolev et D. Motreanu, Blow-up domain for an impulsive reaction-diffusion system, Communications in Applied Nonlinear Analysis 8 (2001), 97-107.

  179. D. Bainov, D. Kolev and D. Motreanu, Blow-up solutions for degenerate impulsive parabolic models, PanAmerican Mathematical Journal 11 (2001), 81-94.

  180. C. Ciulcu, D. Motreanu and M. Sofonea, Analysis of an elastic contact problem with slip dependent coefficient of friction, Mathematical Inequalities and Applications 4 (2001), 465-479.

  181. D. Motreanu and Z. Naniewicz,  A topological approach to hemivariational inequalities with unilateral growth condition, Journal of Applied Analysis 7 (2001), 23-41.

  182. O. Chau, D. Motreanu and M. Sofonea,  A class of quasivariational inequalities with applications to contact problems, Advances in Nonlinear Variational Inequalities 4 (2001), 1-22.
  183. F. Cirstea, D. Motreanu and V. Radulescu, Weak solutions of quasilinear problems with nonlinear boundary condition, Nonlinear Analysis TMA 43 (2001), 623-636.
  184. D. Goeleven and D. Motreanu,  On the solvability of variational inequalities via relaxed complementarity problems, Communications on Applied Analysis 4 (2000), 533-545.
  185. S. Adly and D. Motreanu,  Location of eigensolutions to variational-hemivariational inequalities, Journal of Nonlinear and Convex Analysis, 1 (2000), 255-270.

  186. D. Motreanu and V. Radulescu, Existence results for inequality problems with lack of convexity, Numerical Functional Analysis and Optimization 21 (2000), 869-884.
  187. S. Adly and D. Motreanu,  Periodic solutions for second order differential equations involving nonconvex superpotentials, Journal of Global Optimization 17 (2000), 9-17.
  188. D. Motreanu and M. Sofonea,  Quasivariational inequalities and applications in frictional contact problems with normal compliance, Advances in Mathematical Sciences and Applications 10 (2000), 103-118.
  189. D. Motreanu and V. V. Motreanu,  Coerciveness Property for a Class of Nonsmooth Functionals, Zeitschrift fur Analysis und ihre Anwendungen 19 (2000), 1087-1093.
  190. M. Bocea, D. Motreanu and P. D. Panagiotopoulos,  Multiple solutions for a double eigenvalue hemivariational inequality on a spherelike type manifold, Nonlinear Analysis TMA 42 (2000), 737-749.
  191. S. Marano and D. Motreanu,  Existence of two nontrivial solutions for a class of elliptic eigenvalue problems, Archiv der Mathematik (Basel) 75 (2000), 53-58.
  192. C. Morosanu and D. Motreanu,  The phase field system with a general nonlinearity,
    International Journal of Differential Equations and Applications 1 (2000), 187-204.
  193. C. Morosanu and D. Motreanu,  Uniqueness and approximation for the nonlinear parabolic Equations in Caginalp's model, International Journal of Applied Mathematics 2 (2000), 113-129.
  194. D. Motreanu and M. Sofonea,  Evolutionary variational inequalities arising in quasistatic frictional contact problems for elastic materials, Abstract and Applied Analysis 4 (1999), 255-279.
  195. D. Goeleven and D. Motreanu,  A mathematical approach to the rock interface problems, Journal of Elasticity 55 (1999), 79-97.
  196. D. Goeleven and D. Motreanu, Regularity theorems for a class of variational-hemivariational inequalities, PanAmerican Mathematical Journal 9 (1999), 35-54.
  197. D. Motreanu and Cs. Varga,  A multiple linking minimax principle for locally Lipschitz functionals, Communications in  Applied Analysis 3 (1999), 115-130.
  198. S. Aizicovici, D. Motreanu and N. H. Pavel,  Nonlinear programming problems associated with closed range operators, Applied Mathematics and Optimization 40 (1999), 211-228.
  199. C. Morosanu and D. Motreanu,  A generalized phase field model, Journal of Mathematical Analysis and Applications 237 (1999), 515-540.
  200. S. Dabuleanu and D. Motreanu,  Existence results for a class of eigenvalue quasilinear problems with nonlinear boundary condition, Advances in Nonlinear Variational Inequalities 2 (1999), 41-54.
  201. C. Morosanu and D. Motreanu,  An extension of the nonlinear parabolic equation in Caginalp's model, Communications in Applied Analysis 2 (1998), 159-168.
  202. S. Adly, D. Goeleven and D. Motreanu,; Periodic and homoclinic solutions for nonautonomous systems with discontinuous nonlinearities: a survey on the inequality approach, Advances in  Nonlinear Variational Inequalities 1 (1998), 11-26.
  203. D. Goeleven, D. Motreanu and P. D. Panagiotopoulos,  Eigenvalue problems for variational-hemivariational inequalities at resonance, Nonlinear Analysis TMA 33 (1998), 161-180.
  204. D. Goeleven and D. Motreanu,  Asymptotic eigenvalues and spectral analysis of variational inequalities, Communications in Applied Analysis 2 (1998), 343-372.
  205. D. Goeleven, D. Motreanu and P. D. Panagiotopoulos,  Multiple solutions for a class of eigenvalue problems in hemivariational inequalities, Nonlinear Analysis TMA 29 (1997), 9-26.
  206. D. Goeleven, D. Motreanu and P. D. Panagiotopoulos,  Multiple solutions for a class of hemivariational inequalities involving periodic energy functionals, Mathematical Methods in Applied Sciences 20 (1997), 547-568.
  207. D. Motreanu and V. Radulescu,  Existence theorems for some classes of boundary value problems involving the p-Laplacian, PanAmerican Mathematical Journal 7 (1997), 53-66.
  208. D. Motreanu and Cs. Varga,  Some critical point results for locally Lipschitz functionals, Communications in Applied Nonlinear Analysis 4 (1997), 17-33.
  209. S. Adly, D. Goeleven and D. Motreanu, Periodic and homoclinic solutions for a class of unilateral problems, Discrete and Continuous Dynamic Systems 3 (1997), 579-590.
  210. D. Goeleven and D. Motreanu,  A degree theoretic approach for the study of eigenvalue problems in variational-hemivariational inequalities, Differential Integral Equations 10 (1997), 893-804.
  211. D. Goeleven, D. Motreanu and P. D. Panagiotopoulos,  Semicoercive variational-hemivariational inequalities, Applicable Analysis 65 (1997), 119-134.
  212. D. Motreanu and P. D. Panagiotopoulos,  Double eigenvalue problems for hemivariational inequalities, Archive for Rational Mechanics and Analysis 140 (1997), 225-252.
  213. D. Motreanu,  A saddle-point approach to nonlinear eigenvalue problems, Mathematica Slovaca 47 (1997), 463-477.
  214. D. Motreanu, A transversality result with applications to elliptic problems, Revue Roumaine des Mathematiques Pures et Appliquees 42 (1997), 795-803.
  215. D. Motreanu and Z. Naniewicz,  Discontinuous semilinear problems in vector-valued function spaces, Differential and Integral Equations 9 (1996), 581-598.
  216. D. Motreanu and  P. D. Panagiotopoulos,  On the eigenvalue problem for hemivariational inequalities: existence and multiplicity of solutions, Journal of Mathematical Analysis and Applications 197 (1996), 75-89.
  217. D. Motreanu,  A multiple linking minimax principle, Bulletin of Australian Mathematical Society 53 (1996), 39-49.
  218. D. Goeleven and D. Motreanu, Eigenvalue and dynamic problems for variational and hemivariational inequalities, Communications in Applied Nonlinear Analysis 3 (1996), 1-21.
  219. D. Motreanu and  P. D. Panagiotopoulos,  Nonconvex energy functions, related eigenvalue hemivariational inequalities on the sphere and applications, Journal of Global Optimization 6 (1995), 163-177.
  220. D. Motreanu and  P. D. Panagiotopoulos,  An eigenvalue problem for a hemivariational inequality involving a nonlinear compact operator, Set-Valued Analysis 3 (1995), 157-166.
  221. D. Motreanu,  Existence of critical points in a prescribed set, An. St. "Al. I. Cuza" Iasi 41 (1995), 57-64.
  222. D. Motreanu and  P. D. Panagiotopoulos,  A minimax approach to the eigenvalue problem of hemivariational inequalities and applications, Applicable Analysis 58 (1995), 53-76.
  223. D. Motreanu,  Existence of critical points in a general setting, Set-Valued Analysis 3 (1995), 295-305.
  224. D. Motreanu,  Controllability of projected control systems, Control and Cybernetics 20 (1991), 21-34.
  225. D. Motreanu,  Strong accessibility with respect to a submersion, Problems in Control and Information Theory 19 (1990), 45-54.
  226. D. Motreanu,  Control vector fields with strong accessibility property, Tensor N. S. 49 (1990), 211-217.
  227. D. Motreanu,  Generic finiteness in solving optimal control problems, Annales Polonici Mathematici 49 (1988), 135-145.
  228. D. Motreanu,  Optimization problems on complete Riemannian manifolds, Colloquium Mathematicum 53 (1987), 229-238.
  229. D. Motreanu,  Tangent vectors to sets in the theory of geodesics, Nagoya Mathematical Journal 106 (1987), 29-47.
  230. D. Motreanu and N. H. Pavel,  Flow-invariance for second order differential equations on manifolds and orbital motions, Bolletino Unione Matematica Italiana I. 1-B (1987), 943-964.
  231. D. Motreanu,  Existence for minimization with nonconvex constraints, Journal of Mathematical Analysis and Applications 117 (1986), 128-137.
  232. D. Motreanu and C. Popa,  Hamilton-Jacobi equations on infinite-dimensional Riemannian manifolds, Nonlinear Analysis TMA 9 (1985), 739-761.
  233. D. Motreanu and N. H. Pavel,  Flot-invariance par rapport aux equations differentielles de second ordre sur une variete, Comptes Rendus de l' Academie des Sciences de Paris 297 (1983), 157-160.
  234. D. Motreanu,  Homotopy type of {(Y_i, Y_{0,i},p_i)}-complexes, Rendiconti di Matematica di Roma 2 (1982), 111-115.
  235. D. Motreanu and N. H. Pavel,  Quasi-tangent vectors in flow-invariance and optimization problems on Banach manifolds, Journal of Mathematical Analysis and Applications 88 (1982), 116-132.
  236. D. Motreanu,  A characterization of transversality to distributions, An. St. Univ. "Al. I. Cuza" Iasi 27 (1981), 59-62.
  237. D. Motreanu, Une caracterisation de certaines equivalences d'homotopie, Comptes Rendus de l' Academie des Sciences de Paris 291 (1980), 53-56.
  238. D. Motreanu,  Singular homology of some adjunction spaces more general than CW-complexes, An. Univ. Timisoara 17 (1979), 133-140.
  239. D. Motreanu,  The category of preringed manifolds, Mem. Sec. St. Acad. Rom. 2 (1979), 77-85.
  240. D. Motreanu,  Preringed manifolds and bundles with structure group, Bul. Inst. Polit. Iasi 24 (1978), 19-24.
  241. D. Motreanu, Embeddings of C infinity-subcartesian spaces, An. St. Univ. "Al. I. Cuza" Iasi 25 (1978), 65-70.
  242. D. Motreanu,  Some properties of the reduced suspension and a generalization of CW- complexes, An. St. Univ. "Al. I. Cuza" Iasi 22 (1976), 29-34.
  243. D. Motreanu, Preringed manifolds and their relation to differentiable manifolds, Mathematica (Cluj-Napoca) 18 (41) (1976), 191-194.
  244. D. Motreanu,  Differential spaces, tangent bundles and partitions of unity, Mathematica Balkanica. 5 : 38 (1975), 212-215.

 


III
. Book Chapters and Papers in Refereed Proceedings

  1. D. Motreanu, A degenerate Kirchhoff-type inclusion problem with nonlocal operator, Nonlinear analysis and global optimization, 309–329, Springer Optim. Appl., 167, Springer, Cham, 2021.
  2. D. Motreanu and V.V. Motreanu, (p,q)-Laplacian equations with convection term and a intrinsic operator, Differential and integral inequalities, 589–601, Springer Optim. Appl., 151, Springer, Cham, 2019.
  3. D. Motreanu and V.V. Motreanu, Location results for variational-hemivariational inequalities, Advances in variational and hemivariational inequalities, 65–88, Adv. Mech. Math., 33, Springer, Cham, 2015.
  4. D. Motreanu and P. Winkert, Elliptic problems with nonhomogeneous differential operators and multiple solutions, Mathematics without boundaries, 357–379, Springer, New York, 2014.
  5. D. Motreanu and V. V. Motreanu, Sign – changing Solutions for Nonlinear Elliptic Problems Depending on Parameters, Chapter 15 in: Handbook of Functional Equations: Functional Inequalities, p. 327–364, Springer, New York, 2014.
  6. D. Motreanu and P. Winkert, The Fucik Spectrum for the Negative p-Laplacian with Different BoundaryConditions, Chapter 28 in: Nonlinear Analysis, p. 471–485, Springer, New York, 2012.
  7. S. Carl and D. Motreanu, Sub-supersolution method for multi-valued elliptic and evolution problems, Handbook of nonconvex analysis and applications, p. 45–98, Int. Press, Somerville, MA, 2010.
  8. D. Motreanu, Nonlinear problems in mathematical programming and optimal control, Chapter 26 in: Volume dedicated to the memory of Prof. George Isac, Springer, New York, 2010, p.431-440.
  9. S. Carl and D. Motreanu, Multiple solutions of nonlinear elliptic variational problems, Chapter 7 in: Nonlinear Analysis Research Trends, Nova Science Publishers, New York, 2008, p. 235-255.
  10. V. K. Le and D. Motreanu, On a general minimization problem with constraints, Proceedings of the Conference on Differential & Difference Equations and Applications, Hindawi Publishing Corporation, New York, 2006, pp. 645-654.
  11. D. Motreanu, Minimax theory, duality and applications, Complementarity, duality and symmetry in nonlinear mechanics, 209-223, Adv. Mech. Math., 6, Kluwer Acad. Publ., Boston, MA, 2004.
  12. D. Motreanu, Existence and multiplicity results for variational--hemivariational inequalities in the sense of P. D. Panagiotopoulos, in: Proceedings of the International Conference on Nonsmooth/Nonconvex Mechanics with Applications in Engineering, In memoriam of Professor P. D. Panagiotopoulos, 5-6 July 2002, Thessaloniki, Greece, pp. 23-30.
  13. D. Goeleven and D. Motreanu, Hemivariational inequalities: Eigenvalue problems,  In: "Encyclopedia of Optimization" (C.A. Floudas and P. M. Pardalos, Eds), Kluwer Academic Publishers (2001), vol. 2, pp. 394-399.
  14. D. Goeleven and D. Motreanu, Nonconvex-nonsmooth calculus of variations, In: "Encyclopedia of Optimization" (C.A. Floudas and P. M. Pardalos, Eds), Kluwer Academic Publishers (2001), vol. 4, pp. 31-35.
  15. D. Motreanu, Location of solutions to eigenvalue problems for hemivariational inequalities, Volume dedicated to the Memory of Professor P. D. Panagiotopoulos, Kluwer Academic Publishers, Dordrecht, Boston, London, 2001, pp. 263-276.
  16. S. Aizicovici, D. Motreanu and N. H. Pavel, Fully Nonlinear Programming Problems with Closed Range Operators,  in Differential Equations and Control Theory (S. Aizicovici and N. H. Pavel, eds.), Lecture Notes Pure Appl. Math., vol. 225, M. Dekker, New York, 2001, p. 19-30.
  17. D. Motreanu, Variational-hemivariational inequalities in the sense of P. D. Panagiotopoulos: theory and applications,  The Second International Symposium on Impact and Friction of Solids, Structures and Intelligent Machines, ISIFSM2K, Montreal, August 8-12, 2000, Proceedings, to appear.
  18. D. Goeleven and D. Motreanu, Hyperbolic hemivariational inequality and nonlinear wave equation with discontinuities, From Convexity to Nonconvexity, a volume dedicated to the memory of Professor Gaetano Fichera, Kluwer Academic Publishers, 2001, p. 111-122.
  19. D. Motreanu and  P. D. Panagiotopoulos, Nonsmooth variational methods and applications to discontinuous boundary value problems, Proceedings of the Ninth International Colloquium on Differential Equations, Plovdiv, Bulgaria, 18-23 August 1998 (Editor: D. Bainov), VSP, Utrecht, The Netherlands, 1999, p. 281-288.
  20. D. Goeleven and D. Motreanu, Minimax methods of Szulkin's type in unilateral problems, in: Functional Analysis - Selected Topics (Ed. P. K. Jain), Narosa Publishing House, New Delhi, India, 1998, p. 169-183.
  21. D. Goeleven, D. Motreanu and P. D. Panagiotopoulos, Eigenvalue problems in hemivariational inequalities, Progress in Partial Differential Equations, The Metz Surveys 4 (M. Chipot and I. Shafrir, Ed.), Longman, Harlow, 1996, Research Notes in Mathematics Series 345, p. 66-82.
  22. D. Motreanu and  P. D. Panagiotopoulos, On the buckling of adhesively connected von Karman plates allowing for delamination. An eigenvalue hemivariational inequality approach, Asymptotic theories in plates and shells theory, Longman Scientific & Technical, Harlow, 1995, p. 87-99.
  23. D. Motreanu, Qualitative properties of some critical points of minimax type,  Proceedings of Conference of Geometry and Topology, Cluj-Napoca, 1994, p. 93-97.
  24. D. Motreanu and  P. D. Panagiotopoulos, Hysteresis: the eigenvalue problem for hemivariational inequalities,  Models of hysteresis, Longman Scientific & Technical, Harlow, 1993, p. 102-117.
  25. C. Lefter and D. Motreanu, Critical point methods in nonlinear eigenvalue problems with discontinuities,  International Series of Numerical Mathematics 107, Birkhauser Verlag, Basel, 1992, p. 25-36.
  26. D. Motreanu, Applications of Morse theory in variational and boundary value problems, Classical Analysis, World Scientific, 1992, p. 170-178.
  27. D. Motreanu, Morse functions in variational and boundary value problems, Differential equations and control theory, Longman Scientific & Technical, Harlow, 1991, p. 222-227.
  28. D. Motreanu, Generic existence of Morse functions on infinite dimensional Riemannian manifolds and applications Global Differential Geometry and Global Analysis, Lecture Notes in Mathematics 1481, Springer-Verlag, Berlin, 1991, p. 175-184.
  29. D. Motreanu, Transversality methods in variational and control problems, Proceedings of Differential Geometry and Applications, World Scientific, 1990, p. 265-269.
  30. D. Motreanu, Generic existence of Morse functions, Proceedings of Conference of Geometry and Topology, Timisoara, 1989, p. 167-175.
  31. D. Motreanu, Projected control vector fields and local controllability, Proceedings of Conference of Geometry and Topology, Iasi, 1988, p. 251-256.
  32. D. Motreanu, The existence of Morse functions on $C^\infty$--subcartesian spaces, Proc. Colloq. Geom. Top., Cluj-Napoca, 1979, pp. 190-201.

Invited Talks at Professional Conferences
 


  1. Qualitative Analysis of Some Quasi-Linear Elliptic Problems (invited talk), The 2016 International Conference on Differential Equations, November 5- 7 2016, Rome, Italy.
  2. Quasilinear elliptic problems fully depending on the gradient of the solution (invited talk), Emerging Trends in Applied Mathematics and Mechanics, May 30- June 3 2016, Perpignan, France.
  3. A simple principle to locate nodal solutions, January 18th 2016, University of Reggio Calabria, Italy (invited talk, in "A Second Day on Nonlinear Differential Problems").
  4. Nonlinear elliptic problem driven by a nonhomogeneous operator, The 10th AIMS Conference on Dynamical Systems, Differential Equations ans Applications, July 7th to 11th, 2014 (invited talk, special session organizer of "Variational, topological, and set-valued methods for differential problems", jointly with G. Bonanno, S. Carl, and S. Marano, in Madrid).
  5. Moser Iteration Technique and Regularity, International Symposium on Modern Mathematics and Mechanics, University of Olomouc, Czech Republic, June 23, 2014 (invited talk).
  6. Boundary Value Problems Involving a Nonhomogeneous Operator, International Worshop "Modeling and analysis of nonlinear problems", University of Olomouc, Czech Republic, June 24, 2014 (invited talk).
  7. Smooth Minimizers Versus Sobolev Minimizers, International Worshop "Modeling and analysis of nonlinear problems", University of Olomouc, Czech Republic, June 26, 2014 (invited talk).
  8. Multiple Solutions for Nonlinear Elliptic Problems, International Worshop "Modeling and analysis of nonlinear problems", University of Olomouc, Czech Republic, June 27, 2014 (invited talk).
  9. New results on smooth minimizers versus Sobolev minimizers, International Worshop "Modeling and analysis of nonlinear problems", Perpignan, France, June 5, 2014 (invited talk).
  10. Sign-changing solutions for nonlinear elliptic equations and systems, Tokyo University of Science, Tokyo, Japan, January 15, 2014 (invited talk).
  11. Minimization and variational methods related to nonlinear boundary value problems, session organized within 11th EUROPT Workshop on Advances in Continuous Optimization, Firenze (Italy), June 26-28, 2013
  12. Nonlinear parametric minimization and variational methods for quasilinear equations, Joint Mathematics Meetings, Boston, U.S.A., January 4-7, 2012 (invited speaker).
  13. Minimization and variational Methods for quasilinear equations, Numerical Analysis and Optimization- Theory and Applications (NAOTA 2011), Dhahram, Saudi Arabia, December 18-19, 2011 (invited speaker).
  14. Properties of Fucik spectrum related to various boundary value problems, 25th IFIP TC 7 COnference on System Modeling and Optimization, Berlin, Germany, September 12-16, 2011 (invited speaker).
  15. Multiple solutions for quasilinear elliptic equations with Neumann boundary conditions, The Sixth International Conference on Dynamic Systems and Applications, Atlanta, U.S.A., May 25-28, 2011 (invited speaker).
  16. Multiple solutions for systems of elliptic equations with p-Laplacian operators, Institute of Mathematics of Czech Academy, Czech Republic, December 15, 2010 (one-hour talk).
  17. Fucik spectrum for the p-Laplacian, University of Palermo, Italy, December 13, 2010 (one-hour talk).
  18. Fucik spectrum of p-Laplacian with Robin boundary condition, Guangxi University for Nationalities, Nanning, China, October 19, 2010 one-hour talk).
  19. Multiple solutions with sign-information for elliptic equations and systems, 8th AIMS International Conference on Dynamical Systems, Differential Equations and Applications, Dresden, Germany, May 25-28, 2010 (Organizer of the session "Variational Methods for Non-Smooth Functions and Applications" with S. A. Marano and S. Carl).
  20. Multiple solutions for quasilinear Neumann problems, International Workshop on Variational, Topological and Set-Valued Mathods for Nonlinear Differential Problems, Messina, April 14-16, 2010 (one-hour talk, chair of a session).
  21. Multiple and sign-changing solutions for nonlinear elliptic problems with p-Laplacian, Special Session: Degenerate and Singular Elliptic Partial Differential Equations, Meeting #1056: Joint Mathematics Meetings (American Mathematical Society), San Francisco, California, January 13-16, 2010.
  22. Multiple solutions for asymmetric nonlinear elliptic problems, one-hour talk, University of Reggio Calabria, Italy, October 13, 2009.
  23. Sign-changing solutions for nonlinear elliptic problems, one-hour talk, University of Catania, Italy, October 9, 2009.
  24. Multiple positive solutions for nonlinear elliptic problems, one-hour talk, University of Messina, Italy, October 8, 2009.
  25. Multiple solutions for Dirichlet problems with asymmetric nonlinearities, one-hour talk, Kolloquium, Martin-Luther Universitat Halle-Wittenberg, July 16, 2009.
  26. Multiple solutions for a nonlinear Dirichlet problem involving the p-Laplacian, (p-1)-sublinear terms and asymmetric nonlinearities, one-hour talk, Chinese Academy of Mathematics, June 10, 2009.
  27. Multiple solutions of nonlinear elliptic problems through minimization, variational techniques and Morse theory, The First World Congress on Global Optimization in Engineering and Sciences, Changsha, China, June 1-5, 2009 (one-hour talk, organizer of a session, member of Organizing Committee).
  28. Nonlinear Dirichlet problems with asymetric forcing term, Mississippi State - UAB Conference on Differential Equations and Computational Simulations, Starkville, Mississippi, U.S.A., May 7-9, 2009.
  29. Fifth World Congress of Nonlinear Analysts (WCNA-2008), Hyatt Regency, Orlando, Florida, U.S.A., July 2-July 9, 2008 (one-hour talk, organizer of a session, member in the Global Organizing Committee).
  30. The 7th AIMS International Conference on Dynamical Systems, Differential Equations and Applications, University of Texas at Arlington, U.S.A., May 18-21, 2008 (organizer of a session).
  31. 23rd IFIP TC 7 Conference on System Modelling and Optimization, Krakow, Poland, July 23-27, 2007.
  32. Fifth International Conference on Dynamic Systems and Applications, Atlanta, U.S.A., May 30-June 2, 2007.
  33. Conference Internationale en Analyse Non lisse et Variationnelle dans les Sciences et l'Inginerie, Limoges, France, 20-22 Juin, 2007.
  34. International Workshop on Applied Evolution Equations, CEU Mathematics Department, Budapest, Hungry, May 21-25, 2007 (one hour lecture).
  35. CODE 2007 : Conférence de la SMAI sur l'optimisation et la décision, May 18-20, 2007, Paris, France.
  36. Second International Conference on Complementarity, Duality, and Global Optimization in Science and Engineering, University of Florida, Gainesville, Florida, U.S.A., February 28-March 2, 2007.
  37. 5th International Conférence on Differential Equations and Dynamical Systems, University of Texas-Pan American, Edinburg, Texas, U.S.A., December 16-18, 2006.
  38. Seminar, "Multiple and sign-changing solutions of nonlinear elliptic eigenvalue problems", Institut fur Mathematik, Martin-Luther Universitat, Halle-Wittenberg, Germany, November 2, 2006.
  39. 6eme Conference Internationale AIMS "Systemes Dynamiques, Equations Differentielles et Applications", Poitiers, France, 25-28 juin 2006.
  40. Seminar, "Problèmes aux valeurs propres pour des équations elliptiques", Département de Mathèmatiques, Université d'Avignon, Avignon, France, June 15, 2006.
  41. Optimisation, Analyse multivoque et Analyse non-linéaire, Universite de Pau et des Pays de l'Adour, Pau, France, February 2-3, 2006.
  42. A Minimax Approach for Parametric Eigenvalue Problems with Constraints, Complementary, Duality, and Global Optimization in Science and Engineering (CDGO 2005), Virginia Tech, Blacksburg, Virginia, U.S.A., August 15-17, 2005.
  43. Conference on Differential & Difference Equations and Applications, Melbourne, Florida, U.S.A., August 1-5, 2005.
  44. 22nd IFIP TC 7 Conference on System Modeling and Optimization, Turin, Italy, July 18-22, 2005.
  45. NSF/CBMS Regional Research Conference on New Perspectives for Boundary Value Problems and their Asymptotics, University of Texas-Pan American, Edinburg, Texas, U.S.A., May 16-20, 2005.
  46. International Conference on Nonlinear Operators, Differential Equations and Applications (ICNODEA-2004), Cluj-Napoca, Romania, August 24-27, 2004.
  47. Fourth World Congress of Nonlinear Analysts (WCNA-2004), Hyatt Regency, Orlando, Florida, U.S.A., June 30-July 7, 2004 (one-hour talk, organizer of a session, member in the Global Organizing Committee).
  48. Seminaire du Laboratoire de Modelisation, Analyse Non lineaire et Optimisation, "Une approche de sous et sursolutions pour certaines inclusions differentielles evolutives", Universite de Perpignan, Perpignan, France, October 16, 2003.
  49. Seminar, "A new non-smooth variational approach in studying variational-hemivariational inequalities", Department of Mathematics and Computer Science, Royal Military College of Canada, Kingston, Canada, August 19, 2003.
  50. The Fourth ISAAC Congress, York University, Toronto, Canada, August 11-16, 2003.
  51. System Modelling and Optimization, Sofia Antipolis, France, July 21-25, 2003.
  52. Frontier in Global Optimization, Santorini, Greece, June 8-12, 2003.
  53. Fourth International Conference on Dynamic Systems and Applications, Atlanta, U.S.A., May 21-24, 2003.
  54. Seminaire du Laboratoire de Modelisation, Analyse Non lineaire et Optimisation, "Localisation de solutions dans des problemes non lineaires aux valeurs propres", Universite de Perpignan, Perpignan, France, October 23, 2002.
  55. 6eme Colloque Franco-Roumain de Mathematiques Appliquees, "Principes minimax et applications aux problemes non lineaires", Perpignan, France, September 2-6, 2002.
  56. Twelfth International Colloquium on Differential Equations, Plovdiv, Bulgaria, August 18-23, 2002.
  57. "Nonsmooth Variational Methods with Applications to Nonlinear Problems in Mechanics", The Second International Conference on Optimization and Control with Applications, Yellow Mountain, Tunxi, China, August 17-23, 2002.
  58. Fourth International Conference on Nonlinear Mechanics (ICNM-IV) and IUTAM Symposium on Duality-Complementarity-Symmetry in Nonlinear Mechanics (SDCS), Shanghai, China, August 13-16, 2002 (chair of a session).
  59. International Conference on Nonsmooth/Nonconvex Mechanics with Applications in Engineering, In Memoriam of Professor P. D. Panagiotopoulos, Aristotle University of Thessaloniki, July 5-6, 2002 (member of the Scientific Comitee).
  60. International Congress on Mechatronics, Johannes Kepler University of Linz, July 3-6, 2002 (member of the International Program Commitee).
  61. The Fourth International Conference on Dynamical Systems and Differential Equations, Wilmington, North Carolina, U.S.A., May 24-27, 2002.
  62. Seminaire d'Analyse Numerique et Equations aux Derivees Partielles de Lyon, "Existence, multiplicite et localisation des solutions de certains problemes aux limites avec discontinuites et contraintes", Universite de Lyon, Lyon, France, Mars 12, 2002.
  63. Informs 2002 Anual Meeting, invited session of Nonsmooth Critical Point Theory, Hemivariational inequalities and Global Optimization, Miami Beach, U.S.A., November 4-7, 2001 (organizer of a session).
  64. Second International Conference on Acoustics, Noise and Vibration, Ottawa, Ontario, Canada, August 6-8, 2001 (member of the Scientific Commitee).
  65. Eleventh International Colloquium on Differential Equations, Plovdiv, Bulgaria, August, 2001 (member of the Scientific Commitee).
  66. Tenth International Colloquium on Differential Equations, Plovdiv, Bulgaria, August 19-23, 2000 (member of the Scientific Commitee and of Organizing Comitee).
  67. The Second International Symposium on Impact and Friction of Solids, Structures and Intelligent Machines
    (ISIFSM2K), Montreal, Canada, August 8-12, 2000.
  68. 3rd World Congress of Nonlinear Analysis, Catania, Italy, July 16-23, 2000.
  69. Advances in Convex Analysis and Global Optimization, Honoring the Memory of C. Caratheodory (1873-1950), Pythagorion, Samos, Greece, June 5-9, 2000.
  70. Seminaire d'Analyse non lineaire et d'Optimisation (LACO), "Theoremes de minimax avec des applications aux inegalites variationnelles-hemivariationnelles", Universite de Limoges, Limoges, France, February 9, 2000.
  71. Symposium on "Nonsmooth/Nonconvex Mechanics", Blacksburg, Virginia, U.S.A., June 27-30, 1999.
  72. Seminaire d'Analyse non lineaire et d'Optimisation (LACO), "Localisation des points critiques et applications", Universite de Limoges, Limoges, France, June 4, 1999.
  73. Seminar, "A nonsmooth critical point theory with applications to discontinuous elliptic problems", Universita degli Studi di Palermo, Dipartimento di Matematica ed Applicazioni, Palermo, Italia, October 30, 1998.
  74. Seminar, "A nonsmooth critical point theory with applications to discontinuous elliptic problems", Universita' di Catania, Dipartimento di Matematica, Catania, Italia, 26.10.1998.
  75. 4-eme Colloque Franco-Roumain, Equations aux Derivees Partielles: Theorie, Applications, Calcul, Metz, France, August 31 - September 4, 1998.
  76. The Eighth International Colloquium on Differential Equations, Plovdiv, Bulgaria, August 18-23, 1997.
  77. Seminar, "Variational eigenvalue problems with applications", Universita degli Studi di Palermo, Dipartimento di Matematica ed Applicazioni, Palermo, Italie, Juillet 29, 1999.
  78. First International ISAAC Congres, Delaware, U.S.A., June 2-6, 1997.
  79. Seminar, "Critical point theory in the sense of Szulkin and an extension", Universita' degli Studi di Trento, Laboratorio di Matematica Applicata, Trento, Italy, July 17, 1996.
  80. Second World Congress of Nonlinear Analysts, Athens, Greece, July 10-17, 1996.
  81. Fifth SIAM Conference on Optimization, Victoria, British Columbia, Canada, May 20-22, 1996.
  82. Seminar, "Points critiques avec contraintes et problemes aux valeurs propres", Facultes Universitaires Notre-Dame de la Paix, Departement de Mathematiques, Namur, Belgique, March 25, 1996.
  83. Seminaire, "Methodes variationnelles en theorie des points critiques et applications aux equations elliptiques", Universite de Pau et des Pays de l'Adour, Laboratoire de Mathematiques Appliquees, Pau, France, March 25, 1994.
  84. Journees des Systemes Hamiltoniens. Seminaires du Laboratoire de Physique Appliquee, "Problemes aux valeurs propres et applications aux Equations elliptiques et Systemes hamiltoniens", Universite de Pau, Pau, France, May 2-3, 1994.
  85. Conference on Differential Equations EQUADIFF 8, Bratislava, Slovakia, August 24-28, 1993.
  86. The Fourth Colloquim on the Qualitative Theory of Differential Equations, Szeged, Hungary, August 18-21, 1993.
  87. European Congress of Mathematics, Paris, France, July 6-10, 1992.
  88. The 3-rd International Workshop-Conference on Evolution Equations, Control Theory and Biomathematics,
    Han-sur-Lesse, Belgium, October 20-26, 1991.
  89. Short Conference on Uniform Mathematics, Berne, Swuitzerland, August 14-16, 1991.
  90. 6-th Symposium on Classical Analysis, Kazimir Dolny, Poland, September 23-29, 1991.
  91. Winterschool on Infinite Dimensional Differential Geometry, Vienna, Austria, February 3-9, 1991.
  92. Mathematical Optimization - Theory and Applications, Eisenach, Germany, December 9-13, 1990.
  93. Global Differential Geometry and Global Analysis, Berlin, Germany, June 15-20, 1990.
  94. EQUADIFF 7 Conference, Prague, Czech Republic, August 21-25, 1989.
  95. Seminar, "Quasi-tangent vectors and applications to geodesics", Department of Mathematics, University of Freiburg, Freiburg, Germany, July 27, 1984.