LiX. H., and XuY. 2014. “Second Maximal Subgroups of a Sylow <em class="a-Plus-plus">p</em>-Subgroup and the <em class="a-Plus-plus">p</Em&gt;-Nilpotency of Finite Groups”. Ukrains’kyi Matematychnyi Zhurnal 66 (5), 694–698. https://umj.imath.kiev.ua/index.php/umj/article/view/2170.