C. A. Rosolem, J. R. Machado, and O. Brinholi, “Effects of nitrogen, phosphorus and potassium fertilization on sweet Sorghum grown on a dusky latosol”, PAB, vol. 20, no. 6, pp. 635–641, Apr. 2014, doi: 10.1590/S1678-3921.pab1985.v20.15701.