References
- 1. Avens, A. W., and Pearce, G. W.: Anal. Chem. 11 (1939) 505.
- 2. Curran, J. G., and Miller, E. G.: Beitr. Tabakforsdt. 5 (1969) 65.
- 3. Ibid., p. 69.
- 4. Ibid. pp. 67-68.
- 5. Ibid. p. 68.
- 6. Touey, G. P., and Mumpower, R. C., II: Tob. Sci. 1 (1957) 33.