J. B. V. Subrahmanyam and  C. Radhakrishna,  A Simple Approach of Three phase Distribution System Modeling for Power Flow Calculations.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2010, vol. 39(3). 571 - 576
    [viewed 23 September 2019]. Available from: https://publications.waset.org/pdf/15899.