CANDELA, A. M.; SALVATORE, A. Multiplicity results of an elliptic equation with non-homogeneous boundary conditions. Topological Methods in Nonlinear Analysis, [S. l.], v. 11, n. 1, p. 1–18, 1998. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1998.001. Acesso em: 28 mar. 2024.