GribovskayaE. E., MonakhovV. S., and Sel’kinV. M. “On Solvable Normal Subgroups of Finite Groups”. Ukrains’kyi Matematychnyi Zhurnal 54, no. 7 (July 25, 2002): 950-960. Accessed November 25, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4131.