“EVALUATION SYSTEMS OF ASSOCIATION AND CROP ROTATION OF CORN AND CANAVALIA IN TWO HARVEST TIMES. PANAMA, 1993-94”. Ciencia Agropecuaria, no. 9, Feb. 1998, pp. 85-104, https://idiap.desarrollo-ojs1.metadatos.org/index.php/ciencia-agropecuaria/article/view/459.