de Sá, M.A.C. et al. 2004. Estimating soil erodibility from sonication indexes and other attributes of textural B horizon soils. Pesquisa Agropecuaria Brasileira. 39, 7 (Jul. 2004), 691–699. DOI:https://doi.org/10.1590/S1678-3921.pab2004.v39.6827.