Beutler, Amauri Nelson, et al. “Soil Compaction by Machine Traffic and Least Limiting Water Range Related to Soybean Yield”. Pesquisa Agropecuaria Brasileira, vol. 43, no. 11, Dec. 2008, pp. 1591-00, doi:10.1590/S1678-3921.pab2008.v43.1180.