SALVATORE, A. Some multiplicity results for a superlinear elliptic problem in $\mathbb R^N$. Topological Methods in Nonlinear Analysis, [S. l.], v. 21, n. 1, p. 29–39, 2003. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2003.002. Acesso em: 20 apr. 2024.