Infinite-horizon continuous-time growth models. - Dimitrios Kravvaritis; Nikolaos S. Papageorgiou (Int. J. Syst. Sci., 1996)

Nonlinear Elliptic Problems of Neumann-Type. - Shouchuan Hu; Nikolaos S. Papageorgiou (Period. Math. Hung., 2000)

Minimax control of nonlinear evolution equations. - Nikolaos S. Papageorgiou; Nikolaos Yannakakis (Appl. Math. Comput., 2002)

Optimal control problems for a class of nonlinear evolution equations. - Nikolaos Halidias; Nikolaos S. Papageorgiou (Period. Math. Hung., 2002)

On the Existence of Positive Solutions for Hemivariational Inequalities Driven by the p-Laplacian. - Michael Filippakis; Leszek Gasinski; Nikolaos S. Papageorgiou (J. Glob. Optim., 2005)

Nontrivial Solutions for Resonant Hemivariational Inequalities. - Zdzislaw Denkowski; Leszek Gasinski; Nikolaos S. Papageorgiou (J. Glob. Optim., 2006)

"Two Nontrivial Critical Points for Nonsmooth Functionals via Local Linking and Applications". - Dimitrios Kandilakis; Nikolaos C. Kourogenis; Nikolaos S. Papageorgiou (J. Glob. Optim., 2006)

A multiplicity theorem for the Neumann p-Laplacian with an asymmetric nonsmooth potential. - Giuseppina Barletta; Nikolaos S. Papageorgiou (J. Glob. Optim., 2007)

Nontrivial solutions for Neumann problems with an indefinite linear part. - Leszek Gasinski; Nikolaos S. Papageorgiou (Appl. Math. Comput., 2010)

A bifurcation theorem for the p-logistic equation. - Sophia Th. Kyritsi; Nikolaos S. Papageorgiou (Appl. Math. Comput., 2011)

A pair of positive solutions for the Dirichlet p(z)-Laplacian with concave and convex nonlinearities. - Leszek Gasinski; Nikolaos S. Papageorgiou (J. Glob. Optim., 2013)

Positive solutions for Neumann problems with indefinite and unbounded potential. - Nikolaos S. Papageorgiou; Vicentiu D. Radulescu (Appl. Math. Lett., 2014)

Resonant Neumann problems with indefinite and unbounded potential. - Nikolaos S. Papageorgiou; Vicentiu D. Radulescu (Appl. Math. Lett., 2015)

Bifurcation analysis for nonhomogeneous Robin problems with competing nonlinearities. - Nikolaos S. Papageorgiou; Vicentiu D. Radulescu (Appl. Math. Lett., 2015)

Combined effects of concave-convex nonlinearities and indefinite potential in some elliptic problems. - Nikolaos S. Papageorgiou; Vicentiu D. Radulescu (Asymptot. Anal., 2015)

Infinitely many nodal solutions for semilinear Robin problems with an indefinite linear part. - Nikolaos S. Papageorgiou; Vicentiu D. Radulescu (Appl. Math. Lett., 2017)

Robin problems with general potential and double resonance. - Nikolaos S. Papageorgiou; Calogero Vetro; Francesca Vetro (Appl. Math. Lett., 2017)

Nonhomogeneous Hemivariational Inequalities with Indefinite Potential and Robin Boundary Condition. - Nikolaos S. Papageorgiou; Vicentiu D. Radulescu; Dusan Repovs (J. Optim. Theory Appl., 2017)

Positive solutions for superdiffusive mixed problems. - Nikolaos S. Papageorgiou; Vicentiu D. Radulescu; Dusan Repovs (Appl. Math. Lett., 2018)

Positive solutions for nonvariational Robin problems. - Nikolaos S. Papageorgiou; Vicentiu D. Radulescu; Dusan Repovs (Asymptot. Anal., 2018)

Periodic solutions for a class of evolution inclusions. - Nikolaos S. Papageorgiou; Vicentiu D. Radulescu; Dusan Repovs (Comput. Math. Appl., 2018)

Nonlinear Dirichlet problems with sign changing drift coefficient. - Leszek Gasinski; Nikolaos S. Papageorgiou (Appl. Math. Lett., 2019)

Constant Sign and nodal solutions for nonlinear Robin equations with Locally Defined Source Term. - Nikolaos S. Papageorgiou; Calogero Vetro; Francesca Vetro (Math. Model. Anal., 2020)

A singular (p, q)-equation with convection and a locally defined perturbation. - Nikolaos S. Papageorgiou; Calogero Vetro; Francesca Vetro (Appl. Math. Lett., 2021)

Eigenvalue problems and their perturbations for the weighted (p, q)-Laplacian. - Leszek Gasinski; Nikolaos S. Papageorgiou (Commun. Nonlinear Sci. Numer. Simul., 2021)

A Multiplicity Theorem for Superlinear Double Phase Problems. - Beata Deregowska; Leszek Gasinski; Nikolaos S. Papageorgiou (Symmetry, 2021)

Nonlinear Eigenvalue Problems for the Dirichlet (p, 2)-Laplacian. - Yunru Bai; Leszek Gasinski; Nikolaos S. Papageorgiou (Axioms, 2022)

Inverse Problems for Double-Phase Obstacle Problems with Variable Exponents. - Shengda Zeng; Nikolaos S. Papageorgiou; Patrick Winkert (J. Optim. Theory Appl., 2023)

Existence and Nonexistence of Positive Solutions for Perturbations of the Anisotropic Eigenvalue Problem. - Olena Andrusenko; Leszek Gasinski; Nikolaos S. Papageorgiou (Symmetry, 2023)

Unbounded spectrum for a nonlinear eigenvalue problem with a variable exponent. - Zhenhai Liu; Nikolaos S. Papageorgiou (Appl. Math. Lett., 2023)

Anisotropic eigenvalue problems with singular and sign-changing terms. - Yunru Bai; Nikolaos S. Papageorgiou; Shengda Zeng (Commun. Nonlinear Sci. Numer. Simul., 2024)

Positive solutions for singular problems with multivalued convection. - Yunru Bai; Leszek Gasinski; Nikolaos S. Papageorgiou (Commun. Nonlinear Sci. Numer. Simul., 2024)

Anisotropic (p, q) Equation with Partially Concave Terms. - Leszek Gasinski; Gregoris Makrides; Nikolaos S. Papageorgiou (Symmetry, 2024)

Eigenvalue problems with unbalanced growth. - Nejmeddine Chorfi; Nikolaos S. Papageorgiou; Vicentiu D. Radulescu (Appl. Math. Lett., 2025)

Singular double phase equations with a sign changing reaction. - Yunru Bai; Leszek Gasinski; Nikolaos S. Papageorgiou (Commun. Nonlinear Sci. Numer. Simul., 2025)