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Dittmar J, Voegelin A, Maurer F, Roberts LC, Hug SJ, Saha GC, Ali MA, Badruzzaman AB, Kretzschmar R.Dittmar J, et al. Among authors: kretzschmar r.Environ Sci Technol. 2010 Dec 1;44(23):8842-8. doi: 10.1021/es101962d. Epub 2010 Nov 2.Environ Sci Technol. 2010.PMID: 21043519
Christl I, Brechbühl Y, Graf M, Kretzschmar R.Christl I, et al. Among authors: kretzschmar r.Environ Sci Technol. 2012 Dec 18;46(24):13235-43. doi: 10.1021/es303297m. Epub 2012 Dec 6.Environ Sci Technol. 2012.PMID: 23163533