SNAITH, V. 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://www.mscand.dk/article/view/11617. Acesso em: 6 may. 2024.