Jeffrey Hightower Bernt Schiele Thomas Strang Location- and Context-Awareness, Third International Symposium, LoCA 2007, Oberpfaffenhofen, Germany, September 20-21, 2007, Proceedings LoCA Lecture Notes in Computer Science 4718 Springer 2007 978-3-540-75159-5 db/conf/loca/loca2007.html