CHANG, X.; LI, Y. Existence and multiplicity of nontrivial solutions for semilinear elliptic Dirichlet problems across resonance. Topological Methods in Nonlinear Analysis, [S. l.], v. 36, n. 2, p. 285–310, 2010. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2010.037. Acesso em: 6 may. 2024.