Ningsih EL, Mahmuda S, Hayati MN. Clustering Regency in Kalimantan Island Based on People’s Welfare Indicators Using Ward’s Algorithm with Principal Component Analysis Optimization. IJECSA [Internet]. 2025 Sep. 25 [cited 2025 Sep. 27];4(2):121-34. Available from: https://journal.universitasbumigora.ac.id/IJECSA/article/view/5363