@inproceedings{DBLP:conf/loca/RuppelTKL06,
  author    = {Peter Ruppel and
               Georg Treu and
               Axel K{\"u}pper and
               Claudia Linnhoff-Popien},
  title     = {Anonymous User Tracking for Location-Based Community Services},
  booktitle = {LoCA},
  year      = {2006},
  pages     = {116-133},
  ee        = {http://dx.doi.org/10.1007/11752967_9},
  crossref  = {DBLP:conf/loca/2006},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/loca/2006,
  editor    = {Mike Hazas and
               John Krumm and
               Thomas Strang},
  title     = {Location- and Context-Awareness, Second International Workshop,
               LoCA 2006, Dublin, Ireland, May 10-11, 2006, Proceedings},
  booktitle = {LoCA},
  publisher = {Springer},
  series    = {Lecture Notes in Computer Science},
  volume    = {3987},
  year      = {2006},
  isbn      = {3-540-34150-1},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}