PISANI, L.; SICILIANO, G. Neumann condition in the Schrödinger-Maxwell system. Topological Methods in Nonlinear Analysis, [S. l.], v. 29, n. 2, p. 251–264, 2007. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2007.010. Acesso em: 6 may. 2024.