Chapwanya, Natsai, and Karikoga Gorejena. “Hybrid Unsupervised Machine Learning for Insurance Fraud Detection: PCA-XGBoost-LOF and Isolation Forest”. Journal of Information Systems and Informatics 7, no. 1 (March 31, 2025): 941-959. Accessed February 4, 2026. https://journal-isi.org.adsii.or.id/index.php/isi/article/view/958.