Sá Júnior, J. P. M. e, Araújo, S. M. C. de, Galvão, S. J., Vasconcelos, A. L. de, & Oliveira, E. S. C. de. (2014). Evaluation of methods of chemical analysis for available phosphorus in soils of the "Zona Litoral-Mata" of Pernambuco. Pesquisa Agropecuaria Brasileira, 9(9), 27–33. https://doi.org/10.1590/S1678-3921.pab1974.v9.17247