FERRARIO, D. L. A fixed point index for equivariant maps. Topological Methods in Nonlinear Analysis, [S. l.], v. 13, n. 2, p. 313–340, 1999. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1999.017. Acesso em: 20 apr. 2024.