Preecha Yaom และ Sarawoot Watechagit. (2015) Relationship between the variations of hydrogen in HCNG fuel and the oxygen in exhausted gas. <i>KKU Engineering Journal</i>, <i>42</i>(3), 263-268.Preecha Yaom และ Sarawoot Watechagit. "Relationship between the variations of hydrogen in HCNG fuel and the oxygen in exhausted gas". KKU Engineering Journal 42 (2015):263-268.Preecha Yaom และ Sarawoot Watechagit. Relationship between the variations of hydrogen in HCNG fuel and the oxygen in exhausted gas. Faculty of Engineering, Khon Kaen University:ม.ป.ท. 2015.