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2. Visual fatigue caused by viewing stereoscopic motion images: Background, theories, and observations
3. http://www.sky.com/shop/__PDF/3D/BSkyB_Tech_Spec_COMM_Content_ver1.0.0.docx
4. “Measuring Visual Discomfort associated with 3D Displays,”;Lambooija,2009
5. “Vergence-accommondation conflicts hinder visual performance and cause visual fatigue,”;Hoffman,2008