Ali, M. A., 1984, Photoreception and Vision in Invertebrates: New York, Plenum Press.
Gruber, S. H., 1977, The visual system of sharks, adaptations and capability: American Zoologist, v. 17, p. 453-469.
Wolken, J. J., 1975, Photoprocesses, Photorecptors and Evolution: New York, Academic Press.
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