B R V, Sumith Kumar. “A Novel Method to Convert Gravitational Potential Energy into Electricity Using Piezo Transducers”. Journal of Innovative Ideas in Engineering and Technology (ISSN: 2563-3678) 1, no. 1 (September 30, 2021): 1-2. Accessed December 3, 2021. http://jiiet.com/index.php/jiiet/article/view/90.