Zhang, Xirong, and Tao Zhao. “Weakly SS-Quasinormal Minimal Subgroups and the Nilpotency of a Finite Group”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 2 (February 25, 2014): 187–194. Accessed April 16, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/2122.