Nur Sarma and  Paul M. Tuohy and  Siniša Djurović,  Investigation of Grid Supply Harmonic Effects in Wound Rotor Induction Machines.   journal   = {International Journal of Energy and Power Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2018, vol. 138(6). 450 - 454
    [viewed 16 October 2019]. Available from: https://publications.waset.org/pdf/10009212.