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Source
Farnsworth D. The Farnsworth Dichotomous Test for Color Blindness Panel D-15 Manual. New York, The Psychological Corp., 1947, pp. 1-8.
Simunovic MP, Moore AT. The cone dystrophies. Eye 1998;12:553–65.
National Research Council (US). Committee on Vision. Procedures for testing color vision: report of Working Group 41. National Academies Press, 1981.