KurdachenkoL. A., and OtalJ. “Groups All Proper Quotient Groups of Which Have Chernikov Conjugacy Classes”. Ukrains’kyi Matematychnyi Zhurnal 52, no. 3 (March 25, 2000): 346-353. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4424.