Susanta Kumar Gachhayat and  S. K. Dash,  Non-Convex Multi Objective Economic Dispatch Using Ramp Rate Biogeography Based Optimization.   journal   = {International Journal of Energy and Power Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2017, vol. 126(6). 641 - 645
    [viewed 21 September 2020]. Available from: https://publications.waset.org/pdf/10007208.