1. Purnell, H., “Gas Chromatography”, Prague 1966, Chap. 13 (in Czech).
2. Zhukhovitskii, A. A., Turkeltaub, N. M., “Gas Chromatography”, Moscow 1962, Chap. 16 (in Russian).
3. Lukáč, S., not published.
4. Tunstall, F. I. H., Chromatographia1, 477 (1968).
5. Dietz, R. N., Anal. Chem.40, 1576 (1968).