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2. François, J., Verriest, G., & DeRouck, A. (1955) L'Achromatopsie congénitale. Docum. Ophthal. 9: 338?424.
3. Jayle, G. E., Boyer, R., & Aubert, L. (1962) L'achromatopsie congénitale typique et son expression électro-rétinographique. Ann. Ocul. (Paris) 195: 193?204.
4. Krill, A. E., & Beutler, E. (To be published) The Red Light Absolute Threshold Defect in Protan Carriers.
5. Mc Kay, R. A., & Spivey, B. E. (1962) Generalized Choroidal Angiosclerosis. Arch. Ophthal. 67: 727?735.