M. Barański,  The Analysis of Own Signals of PM Electrical Machines – Example of Eccentricity.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2015, vol. 104(8). 849 - 852
    [viewed 17 October 2019]. Available from: https://publications.waset.org/pdf/10002135.