Baryshovets, P. P. “On Infinite Groups With Complemented Non-Abelian Subgroups”. Ukrains’kyi Matematychnyi Zhurnal 65, no. 11 (November 25, 2013): 1443–1455. Accessed March 28, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2524.