Applied Machine Learning to Anomaly Detection in Enterprise Purchase Processes: A Hybrid Approach Using Clustering and Isolation Forest - Herreros-Martínez, A.; Magdalena-Benedicto, R.; Vila-Francés, J.; Serrano-López, A.J.; Pérez-Díaz, S.; Martínez-Herráiz, J.J. (Information (Switzerland), 2025)