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M. R. Mulyana, H. Budiman, and O. Zuas, “Implementation of ISO 6142- Gas Analysis - Preparation of Calibration Gas Mixtures - Gravimetric Method: Composition Determination and Uncertainty Estimation of Gas Reference Material”, jppipa, pendidikan ipa, fisika, biologi, kimia, vol. 6, no. 2, pp. 221–226, Jul. 2020.