@INPROCEEDINGS{chen2006practical,
  author    = "Mike Y. Chen and Timothy Sohn and Dmitri Chmelev and Dirk Haehnel and Jeffrey Hightower and Jeff Hughes and Anthony LaMarca and Fred Potter and Ian Smith and Alex Varshavsky",
  title     = "Practical Metropolitan-scale Positioning for GSM Phones",
  booktitle = "Proceedings of the Eighth International Conference on Ubiquitous Computing (Ubicomp 2006)",
  series    = "Lecture Notes in Computer Science",
  publisher = "Springer-Verlag" ,
  pages     = "225-242",
  month     = "September",
  year      = {2006}
}