YESHKEYEV, A.R.; OMAROVA, M.T. Сompanions of (n1, n2)-Jonsson theory. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 96, n. 4, p. 75–80, 2019. DOI: 10.31489/2019m4/75-80. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/338. Acesso em: 4 sep. 2025.