Chun Lim, S., T. H. A. . bin Tuan Mohamad, C. . Gomes, and W. F. . Wan Ahmad. “On The Application of Hollow Conductor As Electrical Earthing Electrode”. International Journal of Integrated Engineering, vol. 14, no. 6, Nov. 2022, pp. 184-93, https://publisher.uthm.edu.my/ojs/index.php/ijie/article/view/9353.