Mao , Yu., X. Ma, Vorob'ev N. Т., and T. B. Karaulova. “On Fischer Subgroups of Finite Groups”. Ukrains’kyi Matematychnyi Zhurnal 73, no. 7 (July 20, 2021): 913–919. Accessed April 7, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/6192.