Arutyunov, Andronick, and Alexey Naianzin. “Nontrivial Outer Derivations in Bimodules over Group Rings”. Eurasian Mathematical Journal 13, no. 4 (January 1, 2022): 08–17. Accessed October 5, 2024. https://emj.enu.kz/index.php/main/article/view/268.