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Yellow filters and the absorption of light by the visual pigments of some amazonian fishes. Vision Research, 13(12), 2235–2254
DOI: 10.1016/0042-6989(73)90225-3
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Visual Pigment of the Freshwater Stingray, Paratrygon motoro. Nature, 246(5434), 517
DOI: 10.1038/246517a0