ATALAN, F.; MEDETOGULLARI, E. The Birman–Hilden property of covering spaces of nonorientable surfaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 72, n. 3, p. 307–315, 2020. DOI: 10.37863/umzh.v72i3.6044. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/6044. Acesso em: 5 dec. 2025.