AIZICOVICI, S.; PAPAGEORGIOU, N. S.; STAICU, V. On a $p$-superlinear Neumann $p$-Laplacian equation. Topological Methods in Nonlinear Analysis, [S. l.], v. 36, n. 1, p. 111–130, 2009. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2009.032. Acesso em: 20 jan. 2022.