KONYRKHANOVA, A.A.; KHISAMIEV, N.G. Universal elements of unitriangular matrices groups. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 86, n. 2, p. 79–85, 2017. DOI: 10.31489/2017m2/79-85. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/162. Acesso em: 10 jul. 2025.