COSTA, D. G.; CUESTA, M. Existence results for resonant perturbations of the Fučik spectrum. Topological Methods in Nonlinear Analysis, [S. l.], v. 8, n. 2, p. 295–314, 1996. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1996.034. Acesso em: 22 jul. 2024.