AIZICOVICI, Sergiu; PAPAGEORGIOU, Nikolaos S.; STAICU, Vasile. Existence and multiplicity of solutions for resonant nonlinear Neumann problems. Topological Methods in Nonlinear Analysis, [S. l.], v. 35, n. 2, p. 235–252, 2010. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2010.014. Acesso em: 8 jul. 2025.