BENCI, V.; FORTUNATO, D.; PISANI, L. Remarks on topological solitons. Topological Methods in Nonlinear Analysis, [S. l.], v. 7, n. 2, p. 349–367, 1996. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1996.016. Acesso em: 22 jul. 2024.