Pavinato, Aurélio, et al. “Crop Residues of Winter Species and the Corn Yield in the Minimum Tillage System”. Pesquisa Agropecuaria Brasileira, vol. 29, no. 9, Sept. 1994, pp. 1427-32, doi:10.1590/S1678-3921.pab1994.v29.4192.