Dashkova, O. Yu. “Groups of Finite Non-Abelian Sectional Rank”. Ukrains’kyi Matematychnyi Zhurnal 49, no. 10 (October 25, 1997): 1324–1331. Accessed April 7, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5130.