Martínez, Gustavo A., Lourdes Peña-Córdova, and Luis A. Figueroa. “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, no. 1-2 (April 1, 1996): 1–12. Accessed April 25, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/4318.