Gordón, R., I. Camargo, J. Franco, and A. González. “YIELD CORN GRAIN IMPACT ON ACCOUNT OF NEW RECOMMENDATION IN FERTILIZATION AND PLANT POPULATION MANAGEMENT. AZUERO, PANAMA, 2001.”. Ciencia Agropecuaria, no. 11, Mar. 2002, pp. 31-43, http://200.46.165.126/index.php/ciencia-agropecuaria/article/view/367.