[1. Waltz, P., Häusermann, M., und Nyari, E.: Mitt. Lebensmitt. Hyg. 50 (1959) 166.]Search in Google Scholar
[2. Jarman, R. T.: 14th Tobacco Chemists' Research Conference, Winston-Salem, N. C., 1960. ]Search in Google Scholar
[3. Meyer-Abich, Klaus M.: Beitr. Tabakforsch. 3 (1966) 307.]Search in Google Scholar