References
- 1. Druckrey, H., R. Preussmann: Naturwiss. 19 (1962) 448.
- 2. Neurath, G., B. Pirmann, H. Wichem: Beitr. Tabakforsdt. 2 (1964) 311.
- 3. Serfontein, W. J., P. Hurter: Cancer Res. 28 (1966) 575.
- 4. Barkemeyer, H.: 23rd Tobacco Chemists' Research Conference, Philadelphia, Pa., 1969.
- 5. Pailer, M., H. Klus: Fachliche Mitt. Osterr. Tabakregie 12 (1971) 203.
- 6. Hoffmann, D., J. Vais: 25th Tobacco Chemists' Research Conference, Louisville, Ky., Oct. 1971.
- 7. Neurath, G.: Exp. 23 (1967) 400.
- 8. Johnson, D. E., J. W. Rhoades: American Chemical Society Southwest Regional Meeting, Dec. 1-;, 1971.
- 9. Davis, H., W. George: Beitr. Tabakforsch. 3 (1965) 203.