“NUTRIENTS AND BIOLOGICAL DYNAMICCS IN AN ULTISOL WITH DIFFERENT VEGETABLE COVERAGE. CALABACITO, PANAMA. 1990-1996”. Ciencia Agropecuaria, no. 13, Feb. 2003, pp. 59-80, https://idiap.desarrollo-ojs1.metadatos.org/index.php/ciencia-agropecuaria/article/view/333.