LI, X. H.; XU, Y. 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, v. 66, n. 5, p. 694–698, 25 May 2014.