Budiman, H., Mulyana, M. R., & Zuas, O. (2018). Preparation of calibration standard gas mixtures by primary gravimetric method: a case study on 960 μmol/mol of carbon dioxide in a nitrogen matrix. Engineering and Applied Science Research, 45(3), 173–179. Retrieved from https://ph01.tci-thaijo.org/index.php/easr/article/view/101861