Himanshu Shekhar Maharana and  S. K .Dash,  Ramp Rate and Constriction Factor Based Dual Objective Economic Load Dispatch Using Particle Swarm Optimization.   journal   = {International Journal of Energy and Power Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2017, vol. 126(6). 636 - 640
    [viewed 20 November 2019]. Available from: https://publications.waset.org/pdf/10007207.