A. A. Rodríguez, S. R. Rust, M. T. Tokoyama, and E. O. Riquelme, “CELL WALL DISAPPEARANCE IN A FORAGE SORGHUM HYBRID AND JOHNSON GRASS AFTER TREATMENT WITH A COMMERCIAL MULTI-ENZYME PREPARATION”, JAUPR, vol. 83, no. 1-2, pp. 89–95, Apr. 1999.