FENILLE, Marcio Colombo. Minimizing roots of maps into the two-sphere. Mathematica Scandinavica, Berkeley, CA, United States, v. 111, n. 1, p. 92–106, 2012. DOI: 10.7146/math.scand.a-15215. Disponível em: https://journals.msp.org/mscand/article/view/482. Acesso em: 24 jul. 2026.