Morné Roman and  Robert van Zyl and  Nishanth Parus and  Nishal Mahatho,  Design of a Hand-Held, Clamp-on, Leakage Current Sensor for High Voltage Direct Current Insulators.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2018, vol. 143(11). 809 - 814
    [viewed 23 October 2019]. Available from: https://publications.waset.org/pdf/10009741.