Đồng, Nguyễn Như, and Phan Thành Huấn. 2018. “AN IMPROVED FUZZY K-MEANS CLUSTERING ALGORITHM BASED ON WEIGHT ENTROPY MEASUREMENT AND CALINSKI-HARABASZ INDEX”. Dalat University Journal of Science 8 (2): 13-23. https://doi.org/10.37569/DalatUniversity.8.2.408(2018).