Yeshkeyev, A. R., I. O. Tungushbayeva, and S. M. Amanbekov. “Existentially Prime Jonsson Quasivarieties and Their Jonsson Spectra”. Bulletin of the Karaganda University. Mathematics Series 108, no. 4 (December 30, 2022): 117–124. Accessed December 8, 2025. https://mts.buketov.edu.kz/mathematics-vestnik/article/view/544.