Vendrame, Pedro Rodolfo Siqueira, et al. “Relationship Between Macrofauna, Mineralogy and Exchangeable Calcium and Magnesium in Cerrado Oxisols under Pasture”. Pesquisa Agropecuaria Brasileira, vol. 44, no. 8, Nov. 2010, pp. 996-1001, doi:10.1590/S1678-3921.pab2009.v44.1341.