[1. Pillsbury, H. C., C. C. Bright, K. J. O'Conner, and F. W. Irish: J. Ass. Offic. Anal. Chem. 52 (1969) 458.]Search in Google Scholar
[2. Ogg, C. L., and E. F. Schultz: J. Ass. Offic. Anal. Chem. 53 (1970) 659.]Search in Google Scholar
[3. Willits, C. 0., M. L. Swain, J. A. Connelly, and B. A. Brice: Anal. Chem. 22 (1950) 430.10.1021/ac60039a013]Search in Google Scholar
[4. Griffith, R. B.: Tobacco Science 1. (1957) 130.10.1097/00132586-195704000-00001]Search in Google Scholar
[5. Harvey, W. R., C. E. Badgett, and F. E. Resnik: Tobacco Science 11 (1967) 84.]Search in Google Scholar
[6. Harvey, W. R., H. M. Stahr, and W. C. Smith: Tobacco Science 13 (1969) 13.]Search in Google Scholar
[7. König, W.: J, Prakt. Chem. N. F. 69 (1904) 105.10.1002/prac.19040690107]Search in Google Scholar
[8. Harvey, W. R., R. W. Hale, and R. M. Ikeda: Tobacco Science 14 (1970) 141.]Search in Google Scholar
[9. Charles, J. L., H. M. Stahr, and R. M. Ikeda: Tobacco Science 13 (1969) 54.]Search in Google Scholar
