IZYDOREK, M.; VIDAL, A. An example concerning equivariant deformations. Topological Methods in Nonlinear Analysis, [S. l.], v. 15, n. 1, p. 187–190, 2000. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2000.015. Acesso em: 25 apr. 2024.