Venegas, V. H. A.; Guimarães, P. T. G.; Freire, F. M. Optimum Relative Concentrations of Phosphorus and Sulfur in Coffee Fertilization in a Dark-Red Latosol, at Machado, MG, Brazil. PAB 2014, 22 (4), 359-365. https://doi.org/10.1590/S1678-3921.pab1987.v22.14339.