Felix, Jaqueline Cazado, et al. “Phosphorus, Carbon, and Nitrogen Prediction in Basaltic Soils by NIR Spectroscopy”. Pesquisa Agropecuaria Brasileira, vol. 51, no. 9, Oct. 2016, pp. 1405-16, doi:10.1590/S1678-3921.pab2016.v51.22504.