1. Chromatography in the Petroleum Industry;Cowper,1995
2. Analysis of natural gas: the necessity of multiple standards for calibration
3. International Standard ISO 6143:2000, Gas analysis—comparison methods for determining and checking the composition of calibration gas mixtures, International Organisation for Standardisation, Geneva, 2000.
4. Analysis of natural gas by gas chromatography
5. International Standard ISO 6974-2:2002, Natural gas—determination of composition with defined uncertainty by gas chromatography—Part 2: Measuring system characteristics and statistics for processing of data, International Organisation for Standardisation, Geneva, 2002.