de Sá, N. M. H.; Marriel, I. E.; Franco, A. A. Variability in Individual Nodule Activity of Single Strains of Rhizobium Etli and R. Tropici in Symbiosis With Phaseolus Vulgaris. PAB 1994, 29 (12), 1897-1904. https://doi.org/10.1590/S1678-3921.pab1994.v29.4247.