MASHAYEKHY, B.; PAKDAMAN, A.; TORABI, H. On the Topological Fundamental Groups of Quotient Spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 65, n. 12, p. 1700–1711, 2013. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2547. Acesso em: 5 dec. 2025.