@inproceedings{CTXC:INFOCOM:2004,
  author    = {Xiuzhen Cheng and
               Andrew Thaeler and
               Guoliang Xue and
               Dechang Chen},
  title     = {{TPS}: A Time-Based Positioning Scheme for Outdoor Wireless Sensor Networks},
  booktitle = {INFOCOM},
  year      = {2004},
  ee        = {http://www.ieee-infocom.org/2004/Papers/55_5.PDF}
}