@INPROCEEDINGS{chen2006practical,
  author    = "Timothy Sohn and Alex Varshavsky and Anthony LaMarca and Mike Y.~Chen and Tanzeem Choudhury and Ian Smith and Sunny Consolvo and Jeffrey Hightower and William G.~Griswold and Eyal de~Lara",
  title     = "Mobility Detection Using Everyday GSM Traces",
  booktitle = "Proceedings of the Eighth International Conference on Ubiquitous Computing (Ubicomp 2006)",
  series    = "Lecture Notes in Computer Science",
  publisher = "Springer-Verlag" ,
  pages     = "212-224",
  month     = "September",
  year      = {2006}
}