@article{DBLP:journals/gis/TongLXZ11,
  author    = {Xiaohua Tong and
               Dan Liang and
               Gusheng Xu and
               Songlin Zhang},
  title     = {Positional accuracy improvement: a comparative study in
               Shanghai, China},
  journal   = {International Journal of Geographical Information Science},
  volume    = {25},
  number    = {7},
  year      = {2011},
  pages     = {1147-1171},
  ee        = {http://dx.doi.org/10.1080/13658816.2010.515948},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}