Yeshkeyev A, Yarullina A, Amanbekov S. On categoricity questions for universal unars and undirected graphs under semantic Jonsson quasivariety. M [Internet]. 2023 Sep. 30 [cited 2026 Apr. 1];3(111):165-80. Available from: https://mts.buketov.edu.kz/mathematics-vestnik/article/view/591