Ban, Đoàn V., Hà, H.C. and Quảng, V. Đức 2012. Fuzzy object functional dependences in fuzzy object-oriented databases. Journal of Computer Science and Cybernetics. 28, 2 (Oct. 2012), 103–114. DOI:https://doi.org/10.15625/1813-9663/28/2/2492.