Izosov , A.V. and Sesekin , N.F. (1988) “Groups with the finite number of infinite classes of conjugated subgroups”, Ukrains’kyi Matematychnyi Zhurnal, 40(3), pp. 310–314. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/9140 (Accessed: 17 February 2026).