WASET
    Shuzhen Yao and  Fengjing Zhao and  Jianwei He,  Interactive Model Based On an Extended CPN.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2008, vol. 23(11). 3902 - 3906
    [viewed 07 May 2024]. Available from: https://publications.waset.org/pdf/8478.