[1. Davis, H., and George, W.: Beiträge zur Tabakforschung 3 (1.965) 203.]Search in Google Scholar
[2. Dobrowsky, A.: Tobacco Science 4 (1.960) 1.26. ]Search in Google Scholar
[3· Fordyce, W. B., Hughes, I. W., and lvinson, M. G.: Tobacco Science 5 (1.961.) 70. ]Search in Google Scholar
[4. Waltz, P., and Häusermann, M.: Beiträge zur Tabakforschung 3 (1.965) 1.69. ]Search in Google Scholar
[5. Williamson, J. T., Graham, J. F., and Allman, D. R.: Beiträge zur Tabakforschung 3 (1.965) 233.]Search in Google Scholar