Sunthrasakaran, N. ., N. A. . Mohd Jamail, N. S. . Mohd Jamail, M. N. R. Baharom, M. A. . Mohamed Piah, Q. E. . Kamarudin, M. F. . Sies, N. A. . Othman, and R. . Abd Rahman. “Application of Polarization and Depolarization Current in High Voltage Insulator - A Review”. International Journal of Integrated Engineering, vol. 12, no. 2, Feb. 2020, pp. 159-6, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/5700.