WASET
    Wen-xiang Gu and  Zeng-yu Cai and  Xin-mei Zhang and  Gui-dong Jiang,  Creating or Destroying Objects Plan in the Graphplan Framework .   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2007, vol. 4(4). 94 - 97
    [viewed 25 April 2024]. Available from: https://publications.waset.org/pdf/4429.