Abruña, Fernando, and Miguel A. Lugo-López. “Restoration of Productivity in Tropical Eroded Soils under Appropriate Management”. The Journal of Agriculture of the University of Puerto Rico 71, no. 1 (January 1, 1987): 13–22. Accessed April 18, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/6920.