[1. Braun, J. von, and Baeyer, 0.: Chem. Ber. 58 (1925) 387.10.1002/cber.19250580231]Search in Google Scholar
[2. Gesellschaft für Teerverwertung: Ger. Pat. 238, 138 (1911); Friedlaenders Fortschritte der Teerfabrikation 10 (191o-1912) 332.]Search in Google Scholar
[3. Hoffmann, D., and Wynder, E. L.: Proc. Am. Assoc. Cancer Res. 7 (1966) 32.]Search in Google Scholar
[4. Rodd, E. H.: Chemistry of Carbon Compounds, Vol. IV, Part A, "Heterocyclic Compounds" (1957) Elsevier, New York.]Search in Google Scholar
[5. Rodgman, A., and Cook, L. C.: Tobacco Sei. 6 (1962) 176.]Search in Google Scholar
[6. Schmeltz, I., Stedman, R. L., and Chamberlain, W. J.: Mitt. 19th Tobacco Chemists' Res. Conf.]Search in Google Scholar
[Lexington, Ky., 1965.]Search in Google Scholar
[7. Schmeltz, 1., Stedman, R. L., Chamberlain, W. J., and Stills, C. D.: Chem. Industry (1965) 2009.]Search in Google Scholar
[8. Smith, G. F., and Walters, A. E.: J. Chem. Soc. (1961) 940.10.1039/jr9610000940]Search in Google Scholar
[9. Williamson, J. T., and Clark, P. J.: Beitr. Tabakforsch; 1 (1962) 187.]Search in Google Scholar
