1. ASTM methods can be found in the current edition of ASTM standards.
2. aaa;Eggerston;Anal. Chem.,1960
3. Chromatography in Petroleum Analysis;Butler,1979
4. Institute of Petroleum sub-panel ST-G-6B, unpublished work.
5. D.J. Abbott, J. Chromatogr. Sci., 21 (1983) 425