Stamford, N. P. (2014) “Selection of Bradyrhizobium strains for cowpea growing in an acid soil (LVA) of the semiarid region of Brazil”, Pesquisa Agropecuaria Brasileira, 25(4), pp. 545–552. doi: 10.1590/S1678-3921.pab1990.v25.13453.