Carmona, Ricardo, and Rodrigo Gonzaga Zatz. “Systems of Soil Preparation and the Control of Perenial Weeds in Brachiaria Decumbens”. Pesquisa Agropecuaria Brasileira, vol. 33, no. 9, Sept. 1998, pp. 1515-23, https://doi.org/10.1590/S1678-3921.pab1998.v33.4974.