LINS, S.; SILVA, V. On Maps with a Single Zigzag. CUBO, A Mathematical Journal, [S. l.], v. 5, n. 3, p. 330–341, 2003. Disponível em: https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1680. Acesso em: 20 may. 2024.