H. P. dos Santos, I. Ambrosi, and I. Sandini, “Risk analysis of crop rotation systems for barley, over a ten-year period, in no-tillage system”, PAB, vol. 33, no. 8, pp. 1221–1227, Aug. 1998, doi: 10.1590/S1678-3921.pab1998.v33.4954.