Fontaneli, Renato Serena, et al. “Economic Analysis of Grain Production Systems With Annual Winter Pastures, under No-Tillage”. Pesquisa Agropecuaria Brasileira, vol. 35, no. 11, Nov. 2000, pp. 2129-37, doi:10.1590/S1678-3921.pab2000.v35.6003.