Sevost’yanovE. A. “On the Normality of Families of Space Mappings With Branching”. Ukrains’kyi Matematychnyi Zhurnal 60, no. 10 (October 25, 2008): 1389–1400. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3253.