@InProceedings{thguc,
  author = 	 {Sudarshan S. Chawathe},
  title = 	 {Tracking Hidden Groups Using Communications},
  booktitle = 	 {Proceedings of the NSF/NIJ Symposium on
                  Intelligence and Security Informatics (ISI)},
  year =	 2003,
  series =	 LNCS,
  volume =       {2665},
  address =	 {Tucson, Arizona},
  month =	 jun,
  pages =	 {195-208},
  day = 	 {2-3}
}