1. Barer, R., Joseph, S.: Refractometry of living cells. Q. J. Microscop. Sci.95, part 4, 399?423 (1954)
2. Bernhards, H.: Der Bau des Komplexauges vonAstacus fluviatilis (Potamobius astacus L.). Z. Wiss. Zool.116, 649?707 (1916)
3. Bone, Q., Denton, E.J.: The osmotic effects of electron microscope fixatives. J. Cell Biol.49, 571?581 (1971)
4. Born, M., Wolf, E.: Principles of optics, 4. ed. Oxford, New York: Pergamon Press 1970
5. Carricaburu, P.: Examination of the classical optics of ideal apposition and superposition eyes. In: The compound eye and vision of insects. Horridge, G.A. (ed.), pp. 236?254, Oxford: Clarendon Press 1975