Huyen, T.T.T., Ba Dung, L., Do Van, N. and Van Dinh, M. 2020. INCREMENTALLY UPDATING APPROXIMATION IN INCOMPLETE INFORMATION SYSTEMS UNDER THE VARIATION OF OBJECTS. Journal of Computer Science and Cybernetics. 36, 4 (Dec. 2020), 365–379. DOI:https://doi.org/10.15625/1813-9663/36/4/14650.