Zilli, Jerri Édson, et al. “Soybean Inoculation by Spraying Bradyrhizobium over Plants”. Pesquisa Agropecuaria Brasileira, vol. 43, no. 4, Aug. 2008, pp. 541-4, https://doi.org/10.1590/S1678-3921.pab2008.v43.224.