WASET
    Hongzhi Wang and  Jianzhong Li and  Jizhou Luo,  Topological Queries on Graph-structured XML Data: Models and Implementations.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2008, vol. 24(12). 4164 - 4171
    [viewed 04 May 2024]. Available from: https://publications.waset.org/pdf/6527.