Kowalchuk, G. A., Naoumenko, Z. S., Derikx, P. J. L., Felske, A., Stephen, J. R., & Arkhipchenko, I. A. (1999). Molecular Analysis of Ammonia-Oxidizing Bacteria of the β Subdivision of the Class Proteobacteria in Compost and Composted Materials. Appl Environ Microbiol.

Kowalchuk, George A., Zinaida S. Naoumenko, Piet J. L. Derikx, Andreas Felske, John R. Stephen, und Irina A. Arkhipchenko. "Molecular Analysis of Ammonia-Oxidizing Bacteria of the β Subdivision of the Class Proteobacteria in Compost and Composted Materials." Appl Environ Microbiol 1999.

Kowalchuk, George A., et al. "Molecular Analysis of Ammonia-Oxidizing Bacteria of the β Subdivision of the Class Proteobacteria in Compost and Composted Materials." Appl Environ Microbiol 1999.