B. Mashayekhy, . A. Pakdaman, and H. Torabi, “On the Topological Fundamental Groups of Quotient Spaces”, Ukr. Mat. Zhurn., vol. 65, no. 12, pp. 1700–1711, Dec. 2013, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2547