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2. Sir John Herbert Parsons, 1868-1957;Duke-Elder;Br J Ophthalmol,1957
3. List of queries for: glare, its causes and effects;Gaster;Illuminating Engineer, London,1910
4. Visual acuity and contrast sensitivity, Chapter 10;Pokorny,2006
5. Outdoor Lighting: Physics, Vision and Perception;Schreuder,2008