1. C. A. Cramers, F. A. Wijnheijmer andJ. A. Rijks, J. High Res. Chromatogr., to be published.
2. M. Golay in “Gas Chromatography, 1958”, Butterworth, ed.D. H. Desty, London, 1959, p. 36.
3. J. C. Giddings, Anal. Chem.36, 741 (1964).
4. D. H. Desty andA. Goldup in “Gas Chromatography 1960”, Butterworth, ed.R. P. W. Scott, London, 1960, p. 162–163.