A. Alsaadi and  B. Gholami,  An Effective Approach for Distribution System Power Flow Solution.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2009, vol. 25(1). 1 - 5
    [viewed 27 January 2020]. Available from: https://publications.waset.org/pdf/14357.