@InProceedings{ahlerbollwichmann2008virtualsignposts,
  author = 	 {Dirk Ahlers and Susanne Boll and Daniel Wichmann},
  title = 	 {{Virtual signposts for location-based story-telling}},
  editor = {Edzer Pebesma and Mohamed Bishr and Thomas Bartoschek},
  booktitle = {GI-Days 2008 -- Proceedings of the 6th Geographic Information Days},
  url = {http://gi-days.de/},
  year = 	 {2008},
  isbn = {978-3-936616-54-5},
  address = {M\"{u}nster, Germany},
}