Dynia, José Flavio, and Otávio Antônio de Camargo. “Nitrate Retention in a Variable-Charge Soil, As Influenced by Phosphate Fertilizing and Liming”. Pesquisa Agropecuaria Brasileira, vol. 34, no. 1, Jan. 1999, pp. 141-4, doi:10.1590/S1678-3921.pab1999.v34.5150.