Yaom P, Watechagit S. Relationship between the variations of hydrogen in HCNG fuel and the oxygen in exhausted gas. Eng Appl Sci Res [Internet]. 2015 Sep. 16 [cited 2024 May 19];42(3):263-8. Available from: https://ph01.tci-thaijo.org/index.php/easr/article/view/38305