A. Betha Juanssilfero, A. Cameliawati Djohan, A. Purnawan, and Y. Yopi, “Bioethanol Production from Indica IR.64 Rice Straw Biomass by Direct Saccharification and Fermentation”, Int. J. Adv. Sci. Eng. Inf. Technol., vol. 5, no. 1, pp. 1–5, Feb. 2015.