K. D. Ritchey, F. R. Cox, E. Z. Galrão, and R. S. Yost, “Zinc availability for corn, sorghum and soybean in a clayey dark-red latosol”, PAB, vol. 21, no. 3, pp. 215–225, Apr. 2014, doi: 10.1590/S1678-3921.pab1986.v21.14705.