Thi, Vũ Đức, and Phạm Hạ Thủy. “Type 2 Approximate Functional Dependency and the Outliers With Functional Dependency”. <i>Journal of Computer Science and Cybernetics</i> 23, no. 1 (June 24, 2012): 80–85. Accessed January 10, 2026. https://jcc.vast.vn/jcc/article/view/1117.