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3. New facultative lithoautotrophic nitrite-oxiding bacteria;Bock;Arch. Microbiol.,1983
4. Deutsche Einheitsverfahren zur Wasser-, Abwasser- und Schlammuntersuchung,1984
5. Stickstoffentfernung in einstufigen Belebungsanlagen: Steuerung der Denitrifikation;Ermel,1982