1. Barrer, R. M., Disc. Farad. Soc., No. 7, 135 (1949).
2. Keulemans, A. I. M., “Gas Chromatography”, 194 (Reinhold, New York, 1956).
3. Janák, J., “Vapour Phase Chromatography”, 247 (Butterworths, London, 1957).
4. Brenner, N., and Coates, V. J., Nature, 181, 1401 (1958).