Vu MH, Ho HC, Le VC, Park CW, Tran DQ. A Study on Performance and Emission Characteristics of Direct Injection Naturtal Gas Engine. ETSD [Internet]. 2022 Oct. 15 [cited 2025 Aug. 21];32(4):40-7. Available from: https://jst.vn/index.php/etsd/article/view/307