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Madoni, P., Davoli, D. & Gorbi, G. Acute toxicity of lead, chromium, and other heavy metals to ciliates from activated sludge plants. Bull. Environ. Contam. Toxicol. 53, 420–425 (1994). https://doi.org/10.1007/BF00197235
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DOI: https://doi.org/10.1007/BF00197235