N. V. Anh, V. T. M. Thanh, B. T. Thuy, N. T. Hue, and T. H. Nhue, “MASS BALANCE AND ENERGY ANALYSIS OF A WASTEWATER SLUDGE ANAEROBIC DIGESTION SYSTEM FOR ENERGY RECOVERY”, JSTCE, vol. 10, no. 5, pp. 122–126, Oct. 2016.