Dj. Cherifi and  Y. Miloud and  A. Tahri ,  Development of a Speed Sensorless IM Drives.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2014, vol. 85(1). 117 - 126
    [viewed 16 October 2019]. Available from: https://publications.waset.org/pdf/9997432.