Timothy Sohn Kevin A. Li Gunny Lee Ian E. Smith James Scott William G. Griswold Place-Its: A Study of Location-Based Reminders on Mobile Phones. 232-250 2005 conf/huc/2005 Ubicomp http://dx.doi.org/10.1007/11551201_14 db/conf/huc/ubicomp2005.html#SohnLLSSG05