BEARDON, Alan F.; JORGENSEN, Troels. Fundamental domains for finitely generated Kleinian groups. Mathematica Scandinavica, Berkeley, CA, United States, v. 36, p. 21–26, 1975. DOI: 10.7146/math.scand.a-11559. Disponível em: https://journals.msp.org/mscand/article/view/2056. Acesso em: 25 jul. 2026.