Sittiwong, Wuttichai, Tanagorn Homchampa, Peerapat Prachumcharat, Tharathep Waengern, and Nattakit Kaewtumla. “Fuel consumption of diesel engines combined with producer gas”. Agriculture & Technology RMUTI Journal 4, no. 3 (February 20, 2024): 45–58. accessed December 8, 2025. https://li01.tci-thaijo.org/index.php/atj/article/view/259704.