Kumar, Mahendar, Zubair A Memon, and M. Aslam Uqaili. “Design and Implementation of Hybrid Active Power Filter (HAPF) for UPS System”. International Journal of Integrated Engineering 12, no. 6 (July 19, 2020): 229-238. Accessed June 16, 2021. https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/6727.