[1. Borgerding, M.F., T.A. Perfetti, and S. Ralapati: Determination of nicotine in tobacco, tobacco pro-cessing environments and tobacco products; in: Ana-lytical determination of nicotine and related com-pounds and their metabolites, edited by J.W. Gor-rod and P. Jacob, III, Elsevier, Amsterdam, Ch. 9, 1999, pp. 285-391.10.1016/B978-044450095-3/50010-3]Search in Google Scholar
[2. Federal Register, v. 64, no. 55, March 23, 1999.]Search in Google Scholar
[3. CORESTA recommended method no. 35: Determination of total alkaloids in tobacco by continuous flow analysis; finał approval, Nov. 1994, Cooperati-on Centrę for Scientific Research relative to tobacco, CORESTA Inf. Bulletin 1994 (3/4) 39-46.]Search in Google Scholar
[4. Bennett, C.B., United States Tobacco Manufactu-ring LP, personal communication, May 1999.]Search in Google Scholar
[5. Hahn, J., Chemische Landesuntersuchungsanstalt Sigmaringen, personal communication, May 1999.]Search in Google Scholar
[6. Davis, R.E., Philip Morris Research Center, personal communication, May 1999.]Search in Google Scholar
[7. ISO 5725-2:1994(E): Accuracy (trueness and precision) of measurement methods and results - Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method, International Organization for Standardizati-on, Geneva, 1994.]Search in Google Scholar
[8. AOAC official methods program: policies and procedures manuał: Association of Official Analytical Chemists (AOAC) International, Gaithersburg, Maryland, 1998, p. 3.]Search in Google Scholar
[9. Jacob, III, P. and G.D. Byrd: Use of gas chromato-graphic and mass spectrometric techniques for the determination of nicotine and its metabolites; in: Analytical determination of nicotine and related compounds and their metabolites, edited by J.W. Gorrod and P. Jacob, El, Elsevier, Amsterdam, Ch. 6, 1999, pp. 191-224.10.1016/B978-044450095-3/50007-3]Search in Google Scholar
[10. Boyer, K. W., W. Horwiiz, and R. Albert: Interlabo-ratory variability in tracę element analysis; Anal. Cbem. 57 (1985) 454-459.]Search in Google Scholar