FENILLE, M. C. Minimizing roots of maps into the two-sphere. MATHEMATICA SCANDINAVICA, [S. l.], v. 111, n. 1, p. 92–106, 2012. DOI: 10.7146/math.scand.a-15215. Disponível em: https://www.mscand.dk/article/view/15215. Acesso em: 20 apr. 2024.