Haruhisa Ichikawa We-Duke Cho Ichiro Satoh Hee Yong Youn Ubiquitous Computing Systems, 4th International Symposium, UCS 2007, Tokyo, Japan, November 25-28, 2007, Proceedings UCS Lecture Notes in Computer Science 4836 Springer 2007 978-3-540-76771-8 db/conf/ucs/ucs2007.html