Christopher Richard Wren Yuri A. Ivanov Ishwinder Kaur Darren Leigh Jonathan Westhues SocialMotion: Measuring the Hidden Social Life of a Building. 85-102 2007 conf/loca/2007 LoCA http://dx.doi.org/10.1007/978-3-540-75160-1_6 db/conf/loca/loca2007.html#WrenIKLW07