Ramos, Milton, and Renato Dedecek. “Effects of Soil Tillage Systems and Ways of Applying Fertilizers on Soybean Production”. Pesquisa Agropecuaria Brasileira, vol. 14, no. 2, Apr. 2014, pp. 149-53, doi:10.1590/S1678-3921.pab1979.v14.16669.