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2. Ontogeny of double cones in the retina of perch fry (P. fluviatilis, Teleostei);Ahlbert;Acta Zoologica,1973
3. Ahlbert, I.B., 1975. Organisation of the cone cells in the retina of some teleosts in relation to their feeding habits. Thesis University of Stockholm, ISBN, 91-7223-138-0, pp. 1–29.
4. Les résponses rétinomotrices: caractères et mécanismes;Ali;Vision Research,1971
5. Retinomotor responses;Ali,1975