AZZOLLINI, Antonio. A multiplicity result for a semilinear Maxwell type equation. Topological Methods in Nonlinear Analysis, [S. l.], v. 31, n. 1, p. 83–110, 2008. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2008.005. Acesso em: 8 jul. 2025.