Ramadhani, F. et al. 2026. District Level Child Nutrition Vulnerability in North Sumatra Using Composite Indeks, Machine Learning Benchmarking. Jurnal Sistem Komputer dan Informatika (JSON). 7, 4 (Jun. 2026), 1593–1603. DOI:https://doi.org/10.30865/json.v7i4.9785.