NOWAKOWSKI, Andrzej; ORPEL, Aleksandra. Positive solutions for a nonconvex elliptic Dirichlet problem with superlinear response. Topological Methods in Nonlinear Analysis, [S. l.], v. 27, n. 1, p. 177–194, 2006. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2006.007. Acesso em: 8 jul. 2025.