CADAVID, C.; VÉLEZ-C., J. D. The π-geography problem and the Hurwitz problem. Ingeniería y Ciencia, [S. l.], v. 5, n. 9, p. 91–122, 2009. Disponível em: https://publicaciones.eafit.edu.co/index.php/ingciencia/article/view/469. Acesso em: 4 may. 2024.