HIDALGO, R. A. Kleinian Groups with Common Commutator Subgroup. CUBO, A Mathematical Journal, [S. l.], n. 10, p. 07–14, 1994. Disponível em: https://cubo.ufro.cl/ojs/index.php/cubo/article/view/1820. Acesso em: 20 may. 2024.