N. S. Chernikov, “On groups factorizable in commuting almost locally normal subgroups”, Ukr. Mat. Zhurn., vol. 48, no. 3, pp. 429–431, Mar. 1996, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5342