John Krumm Gregory D. Abowd Aruna Seneviratne Thomas Strang UbiComp 2007: Ubiquitous Computing, 9th International Conference, UbiComp 2007, Innsbruck, Austria, September 16-19, 2007, Proceedings UbiComp Lecture Notes in Computer Science 4717 Springer 2007 978-3-540-74852-6 db/conf/huc/ubicomp2007.html