WASET
    R. Gomathi and  D. Sharmila,  A Hybrid Nature Inspired Algorithm for Generating Optimal Query Plan.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    September 2014, vol. 92(8). 1519 - 1524
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/9999468.