T. Messikh and  S. Mekhilef and  N. A. Rahim,  Adaptive Notch Filter for Harmonic Current Mitigation.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2008, vol. 22(10). 2369 - 2375
    [viewed 22 October 2019]. Available from: https://publications.waset.org/pdf/15853.