A. C. X. Velloso, G. de A. Santos, and D. P. Ramos, “Cation exchange capacity and phosphate adsortion of soils under ‘Cerrado’ (savannah) vegetation of Amapá/Amazonian region”, PAB, vol. 17, no. 1, pp. 27–32, Apr. 2014, doi: 10.1590/S1678-3921.pab1982.v17.15511.