1. Touey, G. P., and Mumpower II, R. C., Tobacco Sci., 1, 33 (1957).
2. Adams, P. I., Tobacco Sci., 12, 144 (1968).
3. Muramatsu, M., Obi, Y., Fukuzumi, T., and Keii, T., J. agric. chem. Soc. Japan, 46, 569 (1972).
4. Baker, R. R., and Kilburn, K. D., Beitr. Tabakforsch., 7, 79 (1973).
5. Egerton, Sir A., Gugan, K., and Weinberg, F. J., Combust. Flame, 7, 63 (1963).