PELLACCI, B. Critical points for some functionals of the calculus of variations. Topological Methods in Nonlinear Analysis, [S. l.], v. 17, n. 2, p. 285–305, 2001. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2001.017. Acesso em: 22 jul. 2024.