1. ISO 19229 (2015) Gas analysis—purity analysis and the treatment of purity data, 1st edn. ISO, International Organization for Standardization, Geneva
2. ISO 6142–1 (2015) Gas analysis—preparation of calibration gas mixtures—gravimetric method for Class I mixtures, 1st edn. ISO, International Organization for Standardization, Geneva
3. ISO 1644 (2003) Gas analysis—preparation of calibration gas mixtures—static volumetric method, 2nd edn. ISO, International Organization for Standardization, Geneva
4. ISO 6145 Gas analysis—preparation of calibration gas mixtures using dynamic methods. ISO 6145, International Organization for Standardization, Geneva, 11 parts
5. BIPM, IEC, IFCC, ILAC, ISO, IUPAC, IUPAP, OIML (2008) Guide to the expression of uncertainty in measurement, JCGM 100:2008, GUM 1995 with minor corrections, BIPM