Pereira, João Carlos, et al. “Efficiency and Competitiveness of Rhizobium Leguminosarum Bv. Phaseoli Strains in Field Beans”. Pesquisa Agropecuaria Brasileira, vol. 26, no. 7, July 1991, pp. 1073-80, https://doi.org/10.1590/S1678-3921.pab1991.v26.3441.