[1. Chouteau, J., Renier, A., Mounat, A., and Hitier, H.: Annales SEITA 1. (1.964) 35·]Search in Google Scholar
[2. Goodall, D. W.: :z.nd Int. Tob. Sci. Congress, Brussels, 1.958, P· 1.75· ]Search in Google Scholar
[3. Papenfus, H. D., and Baxter, D. A.: Tob. Forum, Rhod. 33 (1.969) 5~ ]Search in Google Scholar
[4. Patel, G.: Indian Tob. 24 (1.964) 1.79· ]Search in Google Scholar
[5. Sficas, A. G., Jones, G. -L., and Seltmann, H.: Tob. Sci. 5 (1.961.) 39 ]Search in Google Scholar