Lukashova, T.D., and M.G. Drushlyak. “Torsion Locally Nilpotent Groups With Non-Dedekind Norm of Abelian Non-Cyclic Subgroups”. Carpathian Mathematical Publications 14, no. 1 (June 30, 2022): 247–259. Accessed November 21, 2024. https://vps.pnu.edu.ua/index.php/cmp/article/view/5108.