DILSHODOV , Abrorjon; TO’XTAMAMATOV, Ismatilla. Relyatsion model. Relyatsion algebra, asosiy operatsiyalar. Munosabatlar nazariyasi. Research and Implementation, [S. l.], v. 2, n. 5/2, p. 16–21, 2026. Disponível em: https://rai-journal.uz/index.php/rai/article/view/3008. Acesso em: 14 май. 2026.