O. Y. Dashkova, “Locally nilpotent groups of finite non-Abelian sectional rank”, Ukr. Mat. Zhurn., vol. 47, no. 4, pp. 452–455, Apr. 1995, Accessed: Apr. 23, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5441