@inproceedings{SisLab2147,
       booktitle = {OpenGIS},
           title = {Query Operations for Fuzzy Spatiotemporal Databases},
          author = {Thi Hong Nhan Vu and Jeong Hee Chi and Keun Ho Ryu},
            year = {2004},
             url = {https://eprints.uet.vnu.edu.vn/eprints/id/eprint/2147/}
}