@inproceedings{ButzBausKruegerLohse2001,
  title     = "{A Hybrid Indoor Navigation System}",
  booktitle = {{IUI2001}: {I}nternational {C}onference on {I}ntelligent {U}ser {I}nterfaces},
  address = {New York},
  publisher = {ACM},
  author    = "Andreas Butz and Jörg Baus and Antonio Krüger and Marco Lohse",
  year      = "2001"
}