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7The international Organization for Standardization. ISO 6142 -2001 Gas analysis-Preparation of calibration gas mixture-Gravimetric method [ S ]. Switzerland: ISO copyright office, 2001.
8Guide to the expression of uncertainty in measurement (GUM). BIPM, IEC, IFCC, ISO, IUPAC, IUPAP, OIML, 1st edition, corrected and reprinted in 1995.
9The international Organization for Standardization. ISO 6143 Gas analysis-Comparison methods for determining and checking the composition of calibration gas mixture [ S ]. Switzerland: ISO copyright office, 2001.