IZE, J.; VIGNOLI, A. Equivariant degree for Abelian actions. Part I: Equivariant homotopy groups. Topological Methods in Nonlinear Analysis, [S. l.], v. 2, n. 2, p. 367–413, 1993. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1993.048. Acesso em: 22 jul. 2024.