Kissin, Edward, and Victor Semenovich Shulman. “On Cohomologies and Representations of Groups With Normal Engel Subgroups”. Eurasian Mathematical Journal 13, no. 2 (January 1, 2022): 70–81. Accessed April 3, 2025. https://emj.enu.kz/index.php/main/article/view/258.