Stamford, N. P.; Vieira, I. M. de M. B.; Santos, D. R. dos; Santos, C. E. de R. e S. Selection of Bradyrhizobium Strains for Cowpea Growing in an Acid Soil (LVA) of the Semiarid Region of Brazil. PAB 2014, 25 (4), 545-552. https://doi.org/10.1590/S1678-3921.pab1990.v25.13453.