Methoden zur Untersuchung und Beurteilung der Fliessgewässer
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[1] Niki Simpson,et al. The vegetative key to the British flora , 2009 .
[2] J. Karr,et al. Restoring life in running waters : better biological monitoring , 1998 .
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[1] Niki Simpson,et al. The vegetative key to the British flora , 2009 .
[2] J. Karr,et al. Restoring life in running waters : better biological monitoring , 1998 .