YESHKEYEV, A.R.; OMAROVA, M.T. Chains of existentially closed models of positive (n1, n2)-Jonsson theories. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 96, n. 4, p. 69–74, 2019. DOI: 10.31489/2019m4/69-74. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/337. Acesso em: 3 aug. 2025.