Gung-Hun Jung and  Jong-Hee Park,  The Implementation of Spatio-Temporal Graph to Represent Situations in the Virtual World.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2013, vol. 73(1). 64 - 67
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/938.