@inproceedings{Butz-etal01,
  author	= {Butz, A. and Baus, J. and Kr{\"u}ger, A. and Lohse, M.},
  title		= {A hybrid indoor navigation system},
  booktitle	= {Proceedings of IUI2001: International Conference on Intelligent User Interfaces},
  pages		= {25--33},
  year		= {2001},
  address	= {New York},
  organization	= {ACM}
}