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12. [Ewald Hering's opponent colors. History of an idea]. Baumann C Ophthalmologe; 1992 Jun; 89(3):249-52. PubMed ID: 1303712 [TBL] [Abstract][Full Text] [Related]
13. [Importance of Ernst Engelking in the sensory physiological ophthalmological research]. Jaeger W Klin Monbl Augenheilkd; 1975 Nov; 167(5):745-52. PubMed ID: 1107652 [No Abstract] [Full Text] [Related]
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15. [Frogs, fish and reflection of the sun gave a clue to understanding how the visual impressions reach the brain]. Thorén L; Ulfendahl H Lakartidningen; 2000 Feb; 97(7):724-5. PubMed ID: 10740382 [No Abstract] [Full Text] [Related]