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Madoni, P., Esteban, G. & Gorbi, G. Acute toxicity of cadmium, copper, mercury, and zinc to ciliates from activated sludge plants. Bull. Environ. Contam. Toxicol. 49, 900–905 (1992). https://doi.org/10.1007/BF00203165
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DOI: https://doi.org/10.1007/BF00203165