Fagéria, N.K., Filho, M.P.B. and Zimmermann, F.J.P. (1994) “Characterization of physical and chemical properties of lowland soils of some states of Brazil”, Pesquisa Agropecuaria Brasileira, 29(2), pp. 267–274. doi:10.1590/S1678-3921.pab1994.v29.4052.