Vitorino, Antonio Carlos Tadeu, et al. “Mineralogy, Chemistry and Stability of Silt-Size Aggregates of Soils from the Southeast Region of Brazil”. Pesquisa Agropecuaria Brasileira, vol. 38, no. 1, Jan. 2003, pp. 133-41, doi:10.1590/S1678-3921.pab2003.v38.6555.