Zainal Abidin, N. A. K. ., N. Mohd Nayan, N. Jamel, and A. . Ali. “Investigation of Piezoelectric Harvester Performance for Several Shape of Piezoelectric Using Finite Element Method”. Journal of Tomography System and Sensor Application, vol. 6, no. 2, Dec. 2023, pp. 1-16, http://tssa.my/index.php/jtssa/article/view/212.