TUKIA, Pekka; WANG, Xiantao. Discreteness of subgroups of $\mathrm{SL}(2,\boldsymbol{C})$ containing elliptic elements. Mathematica Scandinavica, Berkeley, CA, United States, v. 91, n. 2, p. 214–220, 2002. DOI: 10.7146/math.scand.a-14386. Disponível em: https://journals.msp.org/mscand/article/view/833. Acesso em: 24 jul. 2026.