Yeshkeyev, A.R., A.K. Issaeva, and N.M. Mussina. “The Atomic Definable Subsets of Semantic Model”. Bulletin of the Karaganda University. Mathematics Series 94, no. 2 (June 28, 2019): 84–91. Accessed August 18, 2025. http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/298.