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• Graf, J. (1961) Tierbestimmungsbuch. München: J.F. Lehmanns Verlag.
     English translation, (1968) Animal Life of Europe. The Naturalist's Reference Book. London: F. Warne.
• Linnaeus, C. (1758) Systema Naturae. Tomus I. Regnum Animale. Holmiae: L. Salvii
• Olsen, L.H., Sunesen, J., & Pedersen, B.V. (2001) Small Freshwater Creatures. Oxford: Oxford University Press.

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