Thi, Vu Duc. “Some Problems on the Functional Dependency Related to Armstrong Relations in the Relational Datamodel”. <i>Journal of Computer Science and Cybernetics</i> 14, no. 1 (March 14, 2016): 1–8. Accessed December 5, 2025. https://vjs.ac.vn/jcc/article/view/7876.