Capó, Bernardo G., and George Samuels. “The Development of a Mathematical Concept to Interpret the Relation Between Plant Composition and Crop Yield”. The Journal of Agriculture of the University of Puerto Rico 37, no. 4 (October 1, 1953): 249–264. Accessed April 30, 2024. https://revistas.upr.edu/index.php/jaupr/article/view/12740.