Andrew T. Duchowski Eric Medlin Anand K. Gramopadhye Brian Melloy Santosh Nair Binocular eye tracking in VR for visual inspection training. 1-8 2001 VRST http://doi.acm.org/10.1145/505008.505010 db/conf/vrst/vrst2001.html#DuchowskiMGMN01