K. Y. Tseng and  C. Y. Wu,  Engineering Optimization Using Two-Stage Differential Evolution.   journal   = {International Journal of Energy and Power Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2020, vol. 161(5). 115 - 120
    [viewed 05 August 2020]. Available from: https://publications.waset.org/pdf/10011194.