E. Diryak and  P. Lefley and  L. Petkovska and  G. Cvetkovski,  Design Optimization of a Double Stator Cup- Rotor Machine.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2012, vol. 71(11). 1351 - 1357
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/5619.