Mat Syai'in and  Adi Soeprijanto and  Takashi Hiyama,  Generator Capability Curve Constraint for PSO Based Optimal Power Flow.   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2009, vol. 29(5). 1079 - 1084
    [viewed 18 February 2020]. Available from: https://publications.waset.org/pdf/542.