SEPPÄLÄ, M.; SORVALI, T. Traces of commutators of Möbius transformations. MATHEMATICA SCANDINAVICA, [S. l.], v. 68, p. 53–58, 1991. DOI: 10.7146/math.scand.a-12345. Disponível em: https://www.mscand.dk/article/view/12345. Acesso em: 28 apr. 2024.