Puentes-Páramo, Y., J. Menjivar-Flores, and F. Aranzazu-Hernández. “Nutrient Concentration in Leaves, a Tool for Nutritional Diagnosis in Cocoa.”. Agronomía Mesoamericana, Vol. 27, no. 2, June 2016, pp. 329-36, doi:10.15517/am.v27i2.19728.