Carmona, R. and Zatz, R. G. (1998) “Systems of soil preparation and the control of perenial weeds in <i>Brachiaria decumbens</i>”;, Pesquisa Agropecuaria Brasileira, 33(9), pp. 1515–1523. doi: 10.1590/S1678-3921.pab1998.v33.4974.