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2. Uber den bei manchen Personen Workommendean Mangel an Farbesinn;Seebeck;Pogg Ann Phys Chem,1837
3. Color Blindness in its Relation to Accidents by Rail and Sea;Holmgren,1877
4. The Physiology of Color Vision with Special Relation to Color Blindness;Edridge Green,1920
5. Lehre Von Den Farbenefindungen;Stilling;Klin Monbl Augenheilkd,1873