WASET
    SangWon Han and  MuWook Pyeon and  Sujung Moon and  DaeKyo Seo,  A Proposal for U-City (Smart City) Service Method Using Real-Time Digital Map.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2016, vol. 119(11). 2017 - 2020
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/10007239.