Belia Mailien, A. Salma, Syafriandi, and D. Fitria. “Comparison K-Means and Fuzzy C-Means Methods to Grouping Human Development Index Indicators in Indonesia”. 2022. UNP Journal of Statistics and Data Science, vol. 1, no. 1, Feb. 2023, pp. 23-30, doi:10.24036/ujsds/vol1-iss1/4.