المصدر: Mobley, R. Keith (2002). An introduction to predictive maintenance (2nd ed.). Butterworth-Heinemann Amruthnath, Nagdev; Gupta, Tarun (2018). "Fault Class Prediction in Unsupervised Learning using Model-Based Clustering Approach" Duyar, Ahmet; Merrill, Walter (March 1992). "Fault diagnosis for the Space Shuttle main engine".