Chun-Yao Lee and  Siang-Ren Wang,  A Study of Grounding Grid Characteristics with Conductive Concrete.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2009, vol. 36(12). 2229 - 2234
    [viewed 22 April 2021]. Available from: https://publications.waset.org/pdf/4042.