N. S. Chernikov, “On Periodic Locally Solvable Groups Decomposable into the Product of Two Locally Nilpotent Subgroups”, Ukr. Mat. Zhurn., vol. 52, no. 7, pp. 965–970, Jul. 2000, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4495