Chernikov, N. S. “On Periodic Locally Solvable Groups Decomposable into the Product of Two Locally Nilpotent Subgroups”.
Ukrains’kyi Matematychnyi Zhurnal 52, no. 7 (July 25, 2000): 965–970. Accessed April 11, 2025.
https://umj.imath.kiev.ua/index.php/umj/article/view/4495.