Wiwil Dzil Izzatil, et al. “Grouping of Regencies Cities In West Sumatra Province Based On Economic Development Indicators Using The Self-Organizing Maps (SOM) Algorithm”. Jurnal MSA ( Matematika Dan Statistika Serta Aplikasinya), vol. 13, no. 2, Oct. 2025, pp. 64-72, doi:10.24252/msa.v13i2.57741.