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2. Pharmaceuticals in the environment - global occurrences and perspectives;aus der Beek;Environ. Toxicol. Chem.,2016
3. Ruhrgütebericht 2017 (Translation: Report on Water Quality of the River Ruhr);AWWR, Ruhrverband,2017
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5. Bergmann A., Fohrmann R., Weber F.-A. (2011): Zusammenstellung von Monitoringdaten zu Umweltkonzentrationen von Arzneimitteln. UBA-Texte 66/2011. (ISBN/ISSN ISSN 1862-4804, 99 Seiten p).