Yeshkeyev, A.R., M.T. Kassymetova, and N.M. Mussina. “Normal Jonsson Theories and Their Kaiser Classes”. Bulletin of the Karaganda University. Mathematics Series 117, no. 1 (March 29, 2025): 199–210. Accessed July 8, 2025. https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/969.