J. G. L. Rodrigues, J. C. Fernandes, F. M. Nascimento, C. A. Gamero, and S. J. Bicudo, “Physical characterization of soil and operational performance of agricultural machines in the deployment of forage sorghum”, Semina: Ciênc. Agrár., vol. 32, no. 4Sup1, pp. 1813–1824, Dec. 2011.