@article{location_model,
  author        = "Albrecht Schmidt and Michael Beigl and Hans-Werner Gellersen",
  title         = "{A location model for communicating and processing of context",
  journal       = "{Personal and Ubiquitous Computing Journal}",
  volume        = "6",
  number        = "5-6",
  year          = "2002",
  pages         = "341-357"
};