Michael S. Henebry, B. T. Ridgeway, Epizoic Ciliated Protozoa of Planktonic Copepods and Cladocerans and Their Possible Use as Indicators of Organic Water Pollution, Transactions of the American Microscopical Society, Vol. 98, No. 4 (Oct., 1979), pp. 495-508
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Henebry et al. (1979) studied this question.
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