Hasibuan, Muhammad Afif Fauzi, Hendra Cipta, and Sajaratud Dur. “Model Based Clustering for Regency City Grouping Based on Community Welfare Indicators in North Sumatra”. Jurnal Pijar Mipa 19, no. 3 (May 19, 2024): 479–487. Accessed November 24, 2024. http://jurnalfkip.unram.ac.id/index.php/JPM/article/view/6595.