Vinh Ninh Dao Kazuhiro Hosoi Masanori Sugimoto A semi-automatic realtime calibration technique for a handheld projector. 43-46 2007 VRST http://doi.acm.org/10.1145/1315184.1315189 conf/vrst/2007 db/conf/vrst/vrst2007.html#DaoHS07