Bianchini, Aluísio, et al. “Traction Performance of an Agricultural Tractor (2 WD) on Alluvial Soil”. Pesquisa Agropecuaria Brasileira, vol. 33, no. 8, Aug. 1998, pp. 1425-30, doi:10.1590/S1678-3921.pab1998.v33.4949.