Martínez, Gustavo A., Lourdes Peña-Córdova, and Luis A. Figueroa. 1996. “A Thermodynamic Evaluation of the Addition of Calcium and Magnesium to an Ultisol: II CaS04 Addition”. The Journal of Agriculture of the University of Puerto Rico 80 (1-2):1-12. https://doi.org/10.46429/jaupr.v80i1-2.4318.