YESHKEYEV, A.R.; YARULLINA, A.R.; AMANBEKOV, S.M. On categoricity questions for universal unars and undirected graphs under semantic Jonsson quasivariety. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 111, n. 3, p. 165–180, 2023. DOI: 10.31489/2023m3/165-180. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/591. Acesso em: 10 jul. 2025.