IZQUIERDO, M. On Klein Surfaces and Dihedral Groups. Mathematica Scandinavica, Berkeley, CA, United States, v. 76, p. 221–232, 1995. DOI: 10.7146/math.scand.a-12538. Disponível em: https://journals.msp.org/mscand/article/view/1088. Acesso em: 25 jul. 2026.