Ahmed Z. Gabr and  Ahmed A. Helal and  Hussein E. Said,  Optimal Design of Substation Grounding Grid Based on Genetic Algorithm Technique.   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2016, vol. 115(7). 863 - 869
    [viewed 12 December 2019]. Available from: https://publications.waset.org/pdf/10004816.