МАМАРАЖАБОВ ЖАХОНГИР ШЕРЗОД ЎҒЛИ. ПОВТОРНЫЕ ОПЕРАТОРЫ. Journal of Universal Science Research, [S. l.], v. 1, n. 1, p. 55–59, 2023. Disponível em: https://universalpublishings.com/index.php/jusr/article/view/15. Acesso em: 22 jul. 2024.