Mario Zuffo, Alan, et al. “Quality of Soybean Seeds in Response to Nitrogen Fertilization and Inoculation With Bradyrhizobium Japonicum”. Pesquisa Agropecuária Tropical [Agricultural Research in the Tropics], vol. 48, no. 3, Aug. 2018, pp. 261-70, https://doi.org/10.5216/pat.v48i3.51638.