H. Shayeghi and  A. Safari and  H. A. Shayanfar,  Multimachine Power System Stabilizers Design Using PSO Algorithm.   journal   = {International Journal of Energy and Power Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2008, vol. 17(5). 934 - 941
    [viewed 03 March 2021]. Available from: https://publications.waset.org/pdf/12942.