KEEN, L. On Infinitely Generated Fuchsian Groups. The Journal of the Indian Mathematical Society, [S. l.], v. 35, n. 1-4, p. 67–85, 1971. DOI: 10.18311/jims/1971/16722. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/16722. Acesso em: 28 apr. 2024.