YESHKEYEV, A.R.; OMAROVA, M.T. An essential base of the central types of the convex theory. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 101, n. 1, p. 119–126, 2021. DOI: 10.31489/2021m1/119-126. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/435. Acesso em: 10 jul. 2025.