Ayyappan GS, Poonthalir R, Raja Raghavan M , Ramesh Babu B, Kota Srinivas. “Comprehensive Study On Induction Motor Condition Monitoring Techniques And Products – A Review”. International Journal of Advanced Science and Technology, Vol. 29, no. 9s, May 2020, pp. 3623 -8, http://sersc.org/journals/index.php/IJAST/article/view/16364.