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Berk, S.G., Gunderson, J.H. & Derk, L.A. Effects of cadmium and copper on chemotaxis of marine and freshwater ciliates. Bull. Environ. Contam. Toxicol. 34, 897–903 (1985). https://doi.org/10.1007/BF01609823
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DOI: https://doi.org/10.1007/BF01609823