1. Stedman, R. L., Burdick, D., and Schmeltz, I., Tob. Sci., 7, 166 (1963), Stedman, R. L., Bull. Inform. CORESTA, No. 4, 11 (1963).
2. Boutwell, R. K., and Bosch, D. K., Cancer Res., 19, 413 (1959).
3. Touey, G. P., and Mumpower, II., R. C., Tob. Sci., 1, 33 (1957).
4. Badger, G. M., Donnelly, J. K., and Spotswood, T. M., Austral. J. Chem., 15, 605 (1962).
5. Sawicki, E., Chemist-Analyst, 53, 56 (1964).