Parentoni, Sidney Netto, and Claudio Lopes de Souza Júnior. “Phosphorus Acquisition and Internal Utilization Efficiency in Tropical Maize Genotypes”. Pesquisa Agropecuaria Brasileira, vol. 43, no. 7, Oct. 2008, pp. 893-01, doi:10.1590/S1678-3921.pab2008.v43.268.