Ryan Aipperspach Tye Rattenbury Allison Woodruff John F. Canny A Quantitative Method for Revealing and Comparing Places in the Home. 1-18 2006 conf/huc/2006 Ubicomp http://dx.doi.org/10.1007/11853565_1 db/conf/huc/ubicomp2006.html#AipperspachRWC06