BALANOV, Z.; KRAWCEWICZ, W. Remarks on the equivariant degree theory. Topological Methods in Nonlinear Analysis, [S. l.], v. 13, n. 1, p. 91–103, 1999. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1999.005. Acesso em: 6 may. 2024.