Emmanuel Munguia Tapia Stephen S. Intille Kent Larson Portable Wireless Sensors for Object Usage Sensing in the Home: Challenges and Practicalities. 19-37 2007 conf/eusai/2007 AmI http://dx.doi.org/10.1007/978-3-540-76652-0_2 db/conf/eusai/ami2007.html#TapiaIL07