[1. Rochus, W., Beiträge zur Tabakforschung (1962), Heft 5, S. 155.]Search in Google Scholar
[2. Hobbs, M. E. et al., Anal. Chem . .28 (1956), S.-2002. ]Search in Google Scholar
[3. Hobbs, M. E. et al., Anal. Chem. 30 (1958), S. 1400]Search in Google Scholar
[4. Quin, L. D. et al., J. of the A.O.A. C. 44 (1961),S.367 ]Search in Google Scholar
[5. Carungno N., Giavannozzi G., 11 Tabacco 6.2 (1958),S. 255 u. S. 265.]Search in Google Scholar
[6. Irby, R. M., Harlow, E. 5., Tobacco 5cience, 3 (1959), S. 52. ]Search in Google Scholar
[7. Hübschen, L., Z. Lebensm. Unters. u. Forsch. 111 (1960),S. 403.]Search in Google Scholar
[8. Kung, I. T. et al., Anal. Chem. 33 (1961), 5. 1505.]Search in Google Scholar
