M. N. Duarte, N. Curi, D. V. Pérez, N. Kampf, and M. E. C. Claessen, “Mineralogy, chemistry and micromorphology of soils of a small watershed in the costal plains of Espírito Santo State, Brazil”, PAB, vol. 35, no. 6, pp. 1237–1250, Jun. 2000.