Yakovleva, E. N. “Solvable Subgroups in Groups With Self-Normalizing Subgroup”. Ukrains’kyi Matematychnyi Zhurnal 60, no. 12 (December 25, 2008): 1716–1721. Accessed May 3, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3284.