↑ Reigh, G.,and M. O'Connell. 1993. Siderophore-mediated iron transport correlate with the presence of specific iron-regulated protein in the outer membrane of Rhizobium meliloti. Journal of Bacteriology. 175, 94-102
↑ Robert, J.M.F. 1992. Effect of pest management system on biological nitrogen fixation In Biological Nitrogen Fixation and Sustainability of Tropical Agriculture, K. Melongoy, M. Gueye, and D.S.C. Spancer, eds. John Wiely and Sons.
↑ Killham, k. 1995. Soil Ecology. Cambridge university. Cambridge
↑ Shim, H. et al. 2000. Rhizosphere competitiveness of trichloroethylene-degrading poplar colonizing bacteria. Applied and Environmental Microbiology. 66 (11): 4673-4678