Li, C., and Yangming Li. 2011. “On <i>ss</i>-Quasinormal and Weakly <i>s</I&gt;-Supplemented Subgroups of Finite Groups”. Ukrains’kyi Matematychnyi Zhurnal 63 (12), 1623-31. https://umj.imath.kiev.ua/index.php/umj/article/view/2830.