[1]Huyen, T.T.T. et al. 2020. INCREMENTALLY UPDATING APPROXIMATION IN INCOMPLETE INFORMATION SYSTEMS UNDER THE VARIATION OF OBJECTS. <i>Journal of Computer Science and Cybernetics</i>. 36, 4 (Dec. 2020), 365–379. DOI:https://doi.org/10.15625/1813-9663/36/4/14650.