Chernikov , S.N. and Levishchenko , S.S. (1992) “Constructive description of finite nondispersed groups where all subgroups of the nonprimary index are Abelian ”, Ukrains’kyi Matematychnyi Zhurnal, 44(6), pp. 818–822. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/8015 (Accessed: 6 December 2025).