Chapwanya, Natsai, and Karikoga Norman 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 March 7, 2026. https://www.journal-isi.org/index.php/isi/article/view/958.