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Edgar, Graham K and Neary, C and Craig, I and Pope, J C (1993) Oculo-motor responses and virtual image displays. AGARD, Combat Automation for Airborne Weapon Systems: Man/Machine Interface Trends and Technologies. p. 18.
Edgar, Graham K and Pope, Jason C D and Craig, Ian R (1993) Visual accomodation problems with head-up and helmet-mounted displays? Displays, 15 (2). pp. 68-75.