Gribovskaya, E.E., Monakhov, V.S. and Sel’kin, V.M. (2002) “On Solvable Normal Subgroups of Finite Groups”, Ukrains’kyi Matematychnyi Zhurnal, 54(7), pp. 950–960. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4131 (Accessed: 7 April 2025).