1. H. Boer, British Patent Specification1, 146, 250.
2. J. V. Brunnock andL. A. Luke, Anal. Chem.40 (1968), 2158.
3. J. V. Brunnock andL. A. Luke, Anal. Chem.41 (1969), 1126.
4. N. G. McTaggart, L. A. Luke andD. Wood, Preprints 8th International Symposium on Gas Chromatography, Dublin 1970.
5. W. I. Asher, M. L. Campbell, W. R. Epperly andJ. L. Robertson, Hydrocarbon Processing48 (1969), 134.