VINH, Trịnh Đình; THI, Vũ Đức. Cover of the set of functional dependencies and quasinorms in database model if block. <b>Journal of Computer Science and Cybernetics</b>, <i>[S. l.]</i>, v. 26, n. 4, p. 312–320, 2012. DOI: 10.15625/1813-9663/26/4/505. Disponível em: https://jcc.vast.vn/jcc/article/view/505. Acesso em: 12 jan. 2026.