“CHEMICAL CONTROL OF WEED IN COWPEA Vigna Unguiculata (L.) Walp. IN TWO PRODUCTION LOCATIONS, PANAMA”. 1991. Ciencia Agropecuaria, no. 7 (February): 35-41. https://idiap.desarrollo-ojs1.metadatos.org/index.php/ciencia-agropecuaria/article/view/494.