A. R. Siringo-ringo, R. Paninggalih, and R. K. Putra, “SCALABLE DETECTION OF COST INEFFICIENCY IN BPJS KESEHATAN CLAIMS USING XGBOOST WITH IMBALANCE LEARNING AND VAEX-BASED BIG DATA PROCESSING”, BAREKENG: J. Math. & App., vol. 20, no. 4, pp. 3531-3544, Aug. 2026.