Fontana, A. et al. 2006. Fertility properties and humic fractions in a Rhodic Ferralsol in Brazilian Cerrado. Pesquisa Agropecuaria Brasileira. 41, 5 (May 2006), 847–853. DOI:https://doi.org/10.1590/S1678-3921.pab2006.v41.7215.