Quoc Khanh Nguyen, Thanh Cong Huynh, and Thanh Tung Nguyen. “A Simulation Study on Performance Characteristics of Simulated Biogas Engine With High Compression Ratio”. Journal of Technical Education Science, vol. 13, no. 3, May 2018, pp. 1-8, https://www.jte.edu.vn/index.php/jte/article/view/269.