Goedert, Wenceslau J., and Edson Lobato. “Agronomic Effectiveness of Phosphates in ‘cerrado’ Soil”. Pesquisa Agropecuaria Brasileira, vol. 15, no. 3, Apr. 2014, pp. 311-8, doi:10.1590/S1678-3921.pab1980.v15.16573.