Chengming Li and  Yong Yin and  Peipei Guo and  Xiaoli Liu,  Research on Urban Point of Interest Generalization Method Based on Mapping Presentation.   journal   = {International Journal of Computer and Systems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2017, vol. 126(6). 714 - 719
    [viewed 25 May 2020]. Available from: https://publications.waset.org/pdf/10007230.