Paul Duff Michael R. McCarthy Angus Clark Henk L. Muller Cliff Randell Shahram Izadi Andy Boucher Andy Law Sarah Pennington Richard Swinford A New Method for Auto-calibrated Object Tracking. 123-140 2005 conf/huc/2005 Ubicomp http://dx.doi.org/10.1007/11551201_8 db/conf/huc/ubicomp2005.html#DuffMCMRIBLPS05