1. G. Gottschalk, J. R. Andreesen, and H. Hippe, The genus Clostridium (nonmedical aspects), in: “The Prokaryotes, A Handbook on Habitats, Isolation, and Identification of Bacteria”, M. P. Starr, H. Stolp, H. G. Truper, A. Balows, and H. G. Schlegel, eds., Springer-Verlag, Berlin, pp. 1767 (1981).
2. E. P. Cato, W. L. George, and S. M. Finegold, Genus Clostridium, in “Bergey’s Manual of Systematic Bacteriology”, P. H. A. Sneath, N. S. Nair, M. E. Sharpe, and J. G. Holt, eds., Williams and Wilkins, Baltimore, 2: 1141 (1986).
3. H. Hachenberg and A. P. Schmidt, “Gas Chromatographic Headspace Analysis”, Heyden and Son Ltd., London (1977).
4. B. Kolb, “Applied Headspace Gas Chromatography”, Heyden and Son Ltd., London (1980).
5. B. V. Ioffe and A. G. Vitenberg, “Head-Space Analysis and Related Methods in Gas Chromatography”, John Wiley and Sons, Inc., New York (1984).