Castro, Gustavo Spadotti Amaral, and Carlos Alexandre Costa Crusciol. “Yield and Mineral Nutrition of Soybean, Maize, and Congo Signal Grass As Affected by Limestone and Slag”. Pesquisa Agropecuaria Brasileira, vol. 48, no. 6, Sept. 2013, pp. 673-81, doi:10.1590/S1678-3921.pab2013.v48.13754.