ETAYO, J. J.; MARTÍNEZ, E. Fuchsian groups generated by half-turns and geometrical characterization of hyperelliptic and symmetric Riemann surfaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 95, n. 2, p. 226–244, 2004. DOI: 10.7146/math.scand.a-14457. Disponível em: https://journals.msp.org/mscand/article/view/762. Acesso em: 24 jul. 2026.