Ji, Min, Xiaogang Jiang, and Fen Wang. 2013. “Feasibility of Anaerobic Co-Digestion of Waste Activated Sludge and Corn Straw to Produce Methane-Batch Experiment”. Asian Journal of Chemistry 25 (15):8793-96. https://doi.org/10.14233/ajchem.2013.15673.