Zhang, Xirong, and Tao Zhao. “Weakly <em class="a-Plus-plus">SS</Em&gt;-Quasinormal Minimal Subgroups and the Nilpotency of a Finite Group”. Ukrains’kyi Matematychnyi Zhurnal 66, no. 2 (February 25, 2014): 187–194. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2122.