DIN EN ISO 6974-2 E:2010-03 Determination of components of natural gas with specified uncertainties by gas chromatography Part 2: Characteristics of measuring systems and statistics of data processing (draft)
2012DIN EN ISO 6974-2:2012-11 Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 2: Uncertainty calculations (ISO 6974-2:2012); German version EN ISO 6974-2:2012
2012DIN EN ISO 6974-1:2012 Natural gas - Determination of composition and associated uncertainty by gas chromatography - Part 1: General guidelines and calculation of composition (ISO 6974-1:2012); German version EN ISO 6974-1:2012