1. H. Hachenberg, A. P. Schmidt, “Gas Chromatographic Headspace Analysis”, Heyden and Son, London, New York, Rheine, 1977.
2. J. M. Hunt, Nature (London)254, 411 (1975).
3. R. Gedenk, Erdöl, Kohle, Erdgas, Petrochem.19 720 (1966).
4. B. Durand, J. Espitalié, Adv. Organ. Geochem.1971, 455 (1972).
5. G. T. Philippi, Geochim. Cosmochim. Acta39, 1353 (1975).