Jamal Moshtagh and  Hassan Pourvali Souraki,  Characteristics Analysis of Voltage Sag and Voltage Swell in Multi-Grounded Four-Wire Power Distribution Systems.   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2009, vol. 31(7). 1485 - 1489
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/7680.