STEINLEIN, H. Spheres and symmetry: Borsuk’s antipodal theorem. Topological Methods in Nonlinear Analysis, [S. l.], v. 1, n. 1, p. 15–33, 1993. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1993.004. Acesso em: 22 oct. 2021.