Monakhov, V. S., and I. L. Sokhor. “Finitely Solvable Groups With Nilpotent Wide Subgroups”. Ukrains’kyi Matematychnyi Zhurnal 68, no. 7 (July 25, 2016): 957–962. Accessed April 14, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/1893.