Lun-Wu Yeh Che-Yen Lu Yu-Hsuan Lin Jia-Liang Liao Yu-Chee Tseng Chien Chen Chih-Wei Yi iLamp: A Sensor-Enhanced Lamp with Surface-Tracking Capability Based on Light Intensity. 1-3 2009 PerCom http://dx.doi.org/10.1109/PERCOM.2009.4912796 conf/percom/2009 db/conf/percom/percom2009.html#YehLLLTCY09