Susilo, Didik Djoko, et al. “Prognostics of Induction Motor Shaft Based on Feature Importance and Least Square Support Vector Machine Regression”. International Journal of Automotive and Mechanical Engineering, vol. 18, no. 1, Mar. 2021, pp. 8464 – 8477, doi:10.15282/ijame.18.1.2021.06.0641.