MUSSO, M.; PASSASEO, D. Positive solutions of nonlinear elliptic problems approximating degenerate equations. Topological Methods in Nonlinear Analysis, [S. l.], v. 6, n. 2, p. 371–397, 1995. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1995.051. Acesso em: 19 apr. 2024.