SEPPÄLÄ, Mika; SORVALI, Tuomas. Leftings of Möbius groups to matrix groups. Mathematica Scandinavica, Berkeley, CA, United States, v. 72, p. 223–234, 1993. DOI: 10.7146/math.scand.a-12446. Disponível em: https://journals.msp.org/mscand/article/view/1181. Acesso em: 25 jul. 2026.