[1. Buyske, D. A., Pelham, W., and Hobbs, M. E.: Anal. Chem. 29 (1957) 105.10.1021/ac60121a030]Search in Google Scholar
[2. British-American Tobacco Company, Germany, Private communication (1970). ]Search in Google Scholar
[3. Cundiff, R. H., Sensabaugh, A. J., and Markunes, P.C.: Tob. Sci. 2 (1958) 25. ]Search in Google Scholar
[4. Stedman, R. L., Burdi&., D., and Sduneltz, I.: Tob. Sci. 7 (1963) 166. ]Search in Google Scholar
[5. Mahnachev, I., Serdyuk, L., and lvanov, N.: CR Acad. Bulg. Sci. 20 (1967) 445·]Search in Google Scholar
[6. Kaburaki, Y., Mikami, Y., and Nakamura, M.: Jap. Monop. Corp. Cent. Res. Inst. Sci. Pap. III (1969) 15:1. ]Search in Google Scholar
[7. Oakley, E. T., Weissbecker, L., and Resnik, F. E.: Anal. Chem. 37 (1965) 380.10.1021/ac60222a02114274121]Search in Google Scholar
[8. Dave, S. B.: J. Chromatogr. Sci. 7 (1969) 389. 10.1093/chromsci/7.7.389]Search in Google Scholar
[9. Van Eenaeme, C., Lambot, 0., Bienfait, J. M., and Pondant, A.: Ann. Med. Vet. nz (1968) :181. ]Search in Google Scholar
[10, Geddes, D. A., and Gilmour, M. N.: J, Chromatogr. Sci. 8 (197o) 394· ]Search in Google Scholar
[11. Davis, H. J., and George, W. T.: Beitr. Tabakfomh. 3 (1965) 203.]Search in Google Scholar
[12. Lakritz, L., Stedman, R. L., and Strange, E. D.: Beitr. Tabakforsdt. 5 (1969) 104.]Search in Google Scholar