Bahrami, M., H. Javadikia, and E. Ebrahimi. “Intelligent Prediction of Fault Severity of Tractor’s Gearbox by Time-Domain and Frequency-Domain (FFT Phase Angle and PSD) Statistics Analysis and ANFIS”. Journal of Mechanical Engineering, vol. 47, no. 1, May 2018, pp. 51-61, doi:10.3329/jme.v47i1.35421.