1. John Steward Mitchell, "Introduction to machinery analysis and monitoring," PennWell Pub. Co., 1993
2. R.B.Randall, A new method of modeling gear faults. ASME Transactions Journal of Mechanical Design 104 (1982), pp. 259-267.
3. A.R.Mohanty and C.Kar, Fault detection in a multistage gearbox by demodulation of motor-current waveform, IEEE Transactions of Industrial Electronics 53(4)(2006),pp.1285-1297.