1) V. R. Protasov: Vision and near orientation of fish (Translated from Russian). Israel Program for Scientific Translations, 1968, Jerusalem, pp. 1-175.
2) G. Kawamura: Proc. Intl. Conf. Dev. Managt. Trop. Living Aqua. Resources, Serdang, Malaysia, 2-5 Aug. 1983, 197-204 (1986).