H. Blasum, “Wild legumes, vetch inoculation, and rhizobial taxonomy in Xiaman farm, eastern edge of the Qinghai-Tibet plateau”, MS Thesis. http://www.blasum.net/ holger/wri/alpleg/index.html
 D. Prévost, P. Drouin, S. Laberge, A. Bertrand, J. Cloutier and G. Lévesque, “Cold-Adapted Rhizobia for Nitrogen Fixation in Temperate Regions,” Canadian Journal of Botany, Vol. 81, 2003, pp. 1153-1161.
 G. Laguerre, P. Van Berkum, N. Amarger and D. Prevost, “Genetic Diversity of Rhizobial Sym-bionts Isolated from Legume Species within the Genera Astragalus, Oxytropis and Onobrychis,” Applied Environmental Microbiology, Vol. 63, December 1997, pp. 4748-4758.
 D. Prevost, L. M. Bordeleau and H. Antoun, “Symbiotic Effectiveness of Indigenous Arctic Rhizobia on a Temperate Forage Legume: Sainfoin (Onobrychis viciifolia),” Plant and Soil, Vol. 104, No. 1, March 1987, pp. 63-69.
 D. Prévost, H. Antoun and L. M. Bordeleau, “Effects of Low Temperature on Nitrogenase Activity in Sainfoin (Onobrychis viciifolia) Nodulated by Arctic Rhizobia,” FEMS Microbiology Ecology, Vol. 45, 1987, pp. 205-210.
 R. J. Roughley, “The Influence of Root Temperature, Rhizobium Strain and Host Selection on the Structure and Nitrogen-Fixing Efficiency of the Root Nodules of Trifolium subterraneum,” Annals of Botany, Vol. 34, 1970, pp. 631-664.
 P. H. Graham, “Co-evolution of Phaseolus Vulgaris and Its Rhizobia,” University of Minnesota, Department of Soil, Water, and Climate, College of Agricultural, Food, and Environmental Sciences, Rhizobia Research Laboratory.
 Z. Zhao, S. E. Williams and G. E. Schuman, “Renodulation and Characterization of Rhizobium Isolates from Cicer Milkvetch (Astragalus cicer L.),” Biology and Fertility of Soils, Vol. 25, No. 2, August 1997, pp. 169-174.
 A. U. Khotyanovich, “Methods for Cultivation of Nitrogen-Fixing Bacteria, Ways of Both Their Obtaining And Preparing of Preparations on Their Base (Methodical Guides),” All-Union Institute of Agricultural Microbiology, Leningrad, 1991, pp. 33-60.
 M. J. Ferris, G. Muyzer and D. M. Ward, “Denaturing Gradient Gel Electrophoresis Profiles of 16S rRNA-Defined Populations Inhabiting a Hot Spring Microbial Mat Community,” Applied Environmental Microbiology, Vol. 62, February 1996, pp. 340-346.
 S. F. Altschul, T. L. Madden, A. A. Schaffer, J. Zhang, Z. Zhang, W. Miller and D. J. Lipman “Gapped: BLAST and PSI-BLAST: A New Generation of Protein Database Search Programs,” Nucleic Acids Research, Vol. 25, September 1997, pp. 3389-3402.
 O. Kh. Khasanov, S. F. Tadjiev, L. Shamsuvalieva, V. I. Konycheva and T. Rakhimova, “Onobrychis Chorasanica Bge.—esparcette chorasanskii,” In: D. K. Saidov, Ed., Adaptation of Forage Plants to Conditions of Arid Zone of Uzbekistan, “Fan” of Uzbek SSR, Tashkent, 1983, pp. 236-245.
 C.F. Barrett, M. A. Parker, “Coexistence of Burkholderia, Cupriavidus, and Rhizobium sp. Nodule Bacteria on Two Mimosa spp. in Costa Rica,” Applied and Environmental Microbiology, Vol. 72, No. 2, February 2006, p. 1198-1206.
 B. Hanane, M. Ourarhi, N. Boukhatem, A. Berrichi, A. Hanaa, M. Rosella, S. Andrea and M. M. El Idrissi, “Diversity of Bacteria that Nodulate Prosopis juliflora in the Eastern Area of Morocco,” Systematic and applied microbiology, 2008, Vol. 31, No. 5, pp. 378-386.
 Y. Benhizia, H. Benhizia, A. Benguedouar, R. Muresu, A. Giacomini and A. Squartini, “Gamma Proteobacteria Can Nodulate Legumes of the Genus Hedysarum”, Systematic and Applied Microbiology, Vol. 27, No. 4, 2004, pp. 462-468.