Gudivok, P. M., and I. V. Shapochka. “On Chernikovp-Groups”. Ukrains’kyi Matematychnyi Zhurnal 51, no. 3 (March 25, 1999): 291–304. Accessed April 14, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/4613.