ฝั้นแก้ว ป., พงศ์พุฒิ ค., พึ่งสุข บ., and ณ ลำปาง พ. “A Comparative Study on Engine Performance of Modified Diesel Engine With Dual Biogas and Pure Biogas Fuel”. RMUTL Engineering Journal, vol. 2, no. 1, Mar. 2017, pp. 25-32, doi:10.14456/rmutlengj.2017.3.