Ruíz, J., and M. Acosta. “CHEMICAL MANAGEMENT OF THE GRAMINEOUS Cynodon Dactylon (L.) Pers AND Rottboellia Cochinchinensis (Lour) Clayton IN CORN AND ITS EFFECT IN THE OUTPUT UNDER SYSTEM WITHOUT TILLAGE.”. Ciencia Agropecuaria, no. 8, Mar. 1995, pp. 1-14, http://revistacienciaagropecuaria.ac.pa/index.php/ciencia-agropecuaria/article/view/467.