Piskunov, A. G. “Restorability of the Vietoris Topology According to the Compacts in the Space of Closed Subgroups ”. Ukrains’kyi Matematychnyi Zhurnal 42, no. 6 (June 19, 1990): 789–794. Accessed April 11, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/8838.