PAPAGEORGIOU, N. S.; SMYRLIS, G. Strongly resonant Robin problems with idefinite and unbounded potential. Topological Methods in Nonlinear Analysis, [S. l.], v. 49, n. 2, p. 511–527, 2016. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2016.085. Acesso em: 19 apr. 2024.