@INPROCEEDINGS{ahlersboll:2009:beyondposition,
  author = {Dirk Ahlers and Susanne Boll},
  title = {{Beyond Position -- Spatial Context for Mobile Retrieval Systems}},
  booktitle = {Proceedings of the 6th Workshop on Positioning, Navigation and Communication
	2009 (WPNC'09)},
  year = {2009},
  pages = {129-134},
  address = {Hanover, Germany},
  doi = {10.1109/WPNC.2009.4907815},
  isbn = {978-1-4244-3292-9},
}