He, X., S. Li, and Youyu Wang. “Groups All Cyclic Subgroups of Which Are BN A-Subgroups”. Ukrains’kyi Matematychnyi Zhurnal 69, no. 2 (February 25, 2017): 284-288. Accessed April 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1695.