Dwi Argo, Bambang, et al. “The Effect of Microwave-NaOH Pretreatment and Hydrolysis Enzyme Using Trichoderma Reesei-Aspergillus Niger on Rice Straw Bioethanol Production”. International Journal on Advanced Science, Engineering and Information Technology, vol. 6, no. 1, Jan. 2016, pp. 20-26, doi:10.18517/ijaseit.6.1.661.