↑ a et bFranck Poly, Sophie Wertz, Elisabeth Brothier et Valérie Degrange, « First exploration of Nitrobacter diversity in soils by a PCR cloning-sequencing approach targeting functional gene nxrA », FEMS Microbiology Ecology, vol. 63, no 1, , p. 132–140 (ISSN0168-6496, DOI10.1111/j.1574-6941.2007.00404.x, lire en ligne, consulté le )
↑H. -J. Bach, A. Hartmann, M. Schloter et J. C. Munch, « PCR primers and functional probes for amplification and detection of bacterial genes for extracellular peptidases in single strains and in soil », Journal of Microbiological Methods, vol. 44, no 2, , p. 173–182 (DOI10.1016/S0167-7012(00)00239-6, lire en ligne, consulté le )