GASIŃSKI, Leszek; PAPAGEORGIOU, Nikolaos S. Multiple Solutions for Nonlinear Dirichlet Problems with Concave Terms. MATHEMATICA SCANDINAVICA, [S. l.], v. 113, n. 2, p. 206–247, 2013. DOI: 10.7146/math.scand.a-15570. Disponível em: https://tidsskrift.dk/math/article/view/15570. Acesso em: 14 aug. 2026.