Araújo, Fábio Fernando de, and Mariangela Hungria. “Soybean Nodulation and Yield When Co-Inoculated With Bacillus Subtilis and Bradyrhizobium Japonicum Bradyrhizobium Elkanii”. Pesquisa Agropecuaria Brasileira, vol. 34, no. 9, Sept. 1999, pp. 1633-4, https://doi.org/10.1590/S1678-3921.pab1999.v34.5420.