Kuzennyi, N. F., and N. N. Semko. “On Groups Close to Metacyclic Groups”. Ukrains’kyi Matematychnyi Zhurnal 48, no. 6 (June 25, 1996): 782–790. Accessed April 11, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5278.