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3. Beattie, D. M. in preparation The chironomid fauna of the Tjeukemeer.
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5. Chambers, M. R. 1973. Notes on the gammarid fauna of the Friesian lake district following the invasion of the alien amphipod Gammarus tigrinus Sexton. Bull. Zool. Mus., Univ. Amsterdam, 3: 1–6.