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 19 September 2024]. Available from: https://publications.waset.org/pdf/938.