JORGENSEN, Troels. Some Remarks of Kleinian Groups. MATHEMATICA SCANDINAVICA, [S. l.], v. 34, p. 101–108, 1974. DOI: 10.7146/math.scand.a-11510. Disponível em: https://tidsskrift.dk/math/article/view/11510. Acesso em: 14 aug. 2026.