Sotomayor-Ramírez, David, Agenol González-Vélez, and Elvin Román-Paoli. “Yam (Dioscorea spp.) Response to Fertilization in Soils of the Semiarid Southern Coast of Puerto Rico”. The Journal of Agriculture of the University of Puerto Rico 87, no. 3-4 (October 1, 2003): 91–103. Accessed December 9, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/1101.