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. American Society for Microbiology.

Kowalchuk, George A., Zinaida S. Naoumenko, Piet J. L. Derikx, Andreas Felske, John R. Stephen, e Irina A. Arkhipchenko. Molecular Analysis of Ammonia-Oxidizing Bacteria of the β Subdivision of the Class Proteobacteria in Compost and Composted Materials. American Society for Microbiology, 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. American Society for Microbiology, 1999.