M. Er-raoudi, M. Diany, H. Aissaoui, and M. Mabrouki, “Gear fault detection using artificial neural networks with discrete wavelet transform and principal component analysis”, J. Mech. Eng. Sci., vol. 10, no. 2, pp. 2016–2029, Sep. 2016, doi: 10.15282/jmes.10.2.2016.6.0190.