WASET
    A. Boudjemai and  A. Zafrane and  R. Hocine,  Hexagonal Honeycomb Sandwich Plate Optimization Using Gravitational Search Algorithm.   journal   = {International Journal of Aerospace and Mechanical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    June 2014, vol. 90(6). 1149 - 1154
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/9998664.