CERAMI, G.; MANISCALCO, C. Multiple positive solutions for a singularly perturbed Dirichlet problem in "geometrically trivial" domains. Topological Methods in Nonlinear Analysis, [S. l.], v. 19, n. 1, p. 63–76, 2002. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2002.004. Acesso em: 22 jul. 2024.