AZZOLLINI, A.; POMPONIO, A. Ground state solutions for the nonlinear Klein-Gordon-Maxwell equations. Topological Methods in Nonlinear Analysis, [S. l.], v. 35, n. 1, p. 33–42, 2010. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2010.002. Acesso em: 20 apr. 2024.