BENCI, V.; FORTUNATO, D. An eigenvalue problem for the Schrödinger-Maxwell equations. Topological Methods in Nonlinear Analysis, [S. l.], v. 11, n. 2, p. 283–293, 1998. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1998.019. Acesso em: 20 apr. 2024.