Mahmood Reza Shakarami and  Reza Sedaghati,  A Study on Integrated Performance of Tap-Changing Transformer and SVC in Association with Power System Voltage Stability .   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2014, vol. 91(7). 1181 - 1188
    [viewed 19 September 2020]. Available from: https://publications.waset.org/pdf/9999205.