Đồng, N. N., & Huấn, P. T. (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)