Natural gas - Extended analysis - Gas-chromatographic method (ISO 6975:1997); German version EN ISO 6975:2005, Corrigendum to DIN EN ISO 6975:2005-09— 2 стр.
Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 2: Measuring-system characteristics and statistics for processing of data (ISO 6974-2:2001); German version EN ISO 6974-2:2002— 28 стр.
Natural gas - Determination of composition with defined uncertainty by gas chromatography - Part 1: Guidelines for tailored analysis (ISO 6974-1:2000); German version EN ISO 6974-1:2001— 22 стр.