TUKIA, P. On discrete groups of the unit disk and their isomorphisms. Annales Fennici Mathematici, [S. l.], n. 504, 1972. DOI: 10.5186/aasfm.1972.504. Disponível em: https://afm.journal.fi/article/view/134160. Acesso em: 26 nov. 2024.