@TechReport{A_Service_for_Aggregating_and_Interpreting_Contextual_Information,
  author = "Filip  Perich",
  title = "{A Service for Aggregating and Interpreting Contextual Information}",
  month = "August",
  year = "2002",
  address = "Palo Alto, CA",
  institution = "Hewlett-Packard Laboratories",
}