Mamidi Ramakrishna Rao,  Optimization of Doubly Fed Induction Generator Equivalent Circuit Parameters by Direct Search Method.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2017, vol. 126(6). 646 - 650
    [viewed 22 January 2021]. Available from: https://publications.waset.org/pdf/10007214.