Kassymetova, M.T. “Pregeometry on the Subsets of Jonsson theory’s Semantic Model”. Bulletin of the Karaganda University. Mathematics Series 90, no. 2 (June 30, 2018): 88–92. Accessed December 8, 2025. https://mts.buketov.edu.kz/mathematics-vestnik/article/view/228.