Giorgio De Michelis Marco Loregian Patrick Martini Directional Interaction with Large Displays Using Mobile Phones. 196-200 2006 conf/percom/2006w PerCom Workshops http://doi.ieeecomputersociety.org/10.1109/PERCOMW.2006.43 db/conf/percom/percomw2006.html#MichelisLM06