ShekharL98'

@inproceedings{DBLP:conf/gis/ShekharL98,
  author    = {Shashi Shekhar and
               Xuan Liu},
  title     = {Direction as a Spatial Object: A Summary of Results},
  booktitle = {ACM-GIS},
  year      = {1998},
  pages     = {69-75},
  ee        = {http://doi.acm.org/10.1145/288692.288706},
  crossref  = {DBLP:conf/gis/98},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/gis/98,
  editor    = {Robert Laurini and
               Kia Makki and
               Niki Pissinou},
  title     = {ACM-GIS '98, Proceedings of the 6th international symposium
               on Advances in Geographic Information Systems, November
               6-7, 1998, Washington, DC, USA},
  publisher = {ACM},
  year      = {1998},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}