D’APRILE, T. Existence and concentration of local mountain passes for a nonlinear elliptic field equation in the semi-classical limit. Topological Methods in Nonlinear Analysis, [S. l.], v. 17, n. 2, p. 239–275, 2001. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2001.015. Acesso em: 27 apr. 2024.