AIZICOVICI, S.; PAPAGEORGIOU, N. S.; STAICU, V. Nodal solutions for nonlinear nonhomogeneous Neumann equations. Topological Methods in Nonlinear Analysis, [S. l.], v. 43, n. 2, p. 421–438, 2016. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2014.025. Acesso em: 25 apr. 2024.