Yokoiama, L.P. and Igreja, A.C.M. 1992. Main crops in middle-west brazilian region: a study of variations from 1975 to 1987. Pesquisa Agropecuaria Brasileira. 27, 5 (May 1992), 727–736. DOI:https://doi.org/10.1590/S1678-3921.pab1992.v27.3704.