PAPAGEORGIOU, N. S.; SANTOS, S. R. A.; STAICU, V. Nontrivial solutions for nonvariational quasilinear Neumann problems. Topological Methods in Nonlinear Analysis, [S. l.], v. 36, n. 1, p. 39–59, 2010. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2010.027. Acesso em: 21 may. 2024.