Rodríguez, Abner A., et al. “CELL WALL DISAPPEARANCE IN A FORAGE SORGHUM HYBRID AND JOHNSON GRASS AFTER TREATMENT WITH A COMMERCIAL MULTI-ENZYME PREPARATION”. The Journal of Agriculture of the University of Puerto Rico, vol. 83, no. 1-2, Apr. 1999, pp. 89-95, doi:10.46429/jaupr.v83i1-2.3866.