ANELLO, G. Multiple nonnegative solutions for elliptic boundary value problems involving the $p$-Laplacian. Topological Methods in Nonlinear Analysis, [S. l.], v. 26, n. 2, p. 355–366, 2005. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2005.036. Acesso em: 22 jul. 2024.