FRIGON, M. On a generalized critical point theory on gauge spaces and applications to elliptic problems on ${\mathbb R}^N$. Topological Methods in Nonlinear Analysis, [S. l.], v. 17, n. 1, p. 67–89, 2001. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2001.005. Acesso em: 26 apr. 2024.