I. Ambrosi, H. P. dos Santos, R. S. Fontaneli, and S. M. Zoldan, “Profitability and risk of production systems of grains combined with winter pastures”, PAB, vol. 36, no. 10, pp. 1213–1219, Oct. 2001, doi: 10.1590/S1678-3921.pab2001.v36.6248.