On a class of semipositone discrete boundary value problems

Variational methods for non-differentiable functionals and their applications to partial differential equations

Kung-Ching Chang · Journal of Mathematical Analysis and Applications · 1981 · 874 citations

Natural Sciences, Mathematics, Differential Equations +13

Multiple positive solutions of singular and nonsingular discrete problems via variational methods

Ravi P. Agarwal, Kanishka Perera, Donal O’Regan · Nonlinear Analysis · 2004 · 196 citations

Natural Sciences, Mathematics, Computational Mechanics +14

Nonlinear eigenvalue problems with semipositone structure

Alfonso Castro, C. Maya, R. Shivaji · DOAJ (DOAJ: Directory of Open Access Journals) · 2000 · 53 citations

Natural Sciences, Mathematics, Differential Equations +8

Nonnegative solutions for a class of radially symmetric nonpositone problems

Alfonso Castro, R. Shivaji · Proceedings of the American Mathematical Society · 1989 · 52 citations · Full text

Natural Sciences, Mathematics, Applied Mathematics +7