DRMOTA, Michael. Combinatorics and Asymptotics on Trees. CUBO, A Mathematical Journal, [S. l.], v. 6, n. 2, p. 105–136, 2004. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1642. Acesso em: 11 mar. 2026.