P. Kanakaraj, D. RavichandranT. Vigneswaran, B. Vinothkumar. “Optimal Stack Configuration for Piezoelectric Power Generation”. International Journal of Advanced Science and Technology, Vol. 29, no. 6s, Apr. 2020, pp. 180 -86, http://sersc.org/journals/index.php/IJAST/article/view/8744.