JORGENSEN, Troels. Some Remarks of Kleinian Groups. Mathematica Scandinavica, Berkeley, CA, United States, v. 34, p. 101–108, 1974. DOI: 10.7146/math.scand.a-11510. Disponível em: https://journals.msp.org/mscand/article/view/2137. Acesso em: 25 jul. 2026.