SNAITH, Victor P. A note on symmetric maps for spheres. MATHEMATICA SCANDINAVICA, [S. l.], v. 38, p. 78–80, 1976. DOI: 10.7146/math.scand.a-11617. Disponível em: https://tidsskrift.dk/math/article/view/11617. Acesso em: 14 aug. 2026.