Ihssen, J., Horn, M. A., Matthies, C., Gößner, A., Schramm, A., & Drake, H. L. (2003). N(2)O-Producing Microorganisms in the Gut of the Earthworm Aporrectodea caliginosa Are Indicative of Ingested Soil Bacteria. Appl Environ Microbiol.

Ihssen, Julian, Marcus A. Horn, Carola Matthies, Anita Gößner, Andreas Schramm, and Harold L. Drake. "N(2)O-Producing Microorganisms in the Gut of the Earthworm Aporrectodea Caliginosa Are Indicative of Ingested Soil Bacteria." Appl Environ Microbiol 2003.

Ihssen, Julian, et al. "N(2)O-Producing Microorganisms in the Gut of the Earthworm Aporrectodea Caliginosa Are Indicative of Ingested Soil Bacteria." Appl Environ Microbiol 2003.