Nguyen, H., N. T. U. Nhi, and L. N. Duy. “FUZZY RELATIONAL DATABASE MODEL AND MANAGEMANT SYSTEM FOR IMPRECISE INFORMATION”. Journal of Computer Science and Cybernetics, vol. 37, no. 2, May 2021, p. 145-62, doi:10.15625/1813-9663/37/2/15346.