[1. Mattina, C. F.: Tob. Sci.16 (1972) 113-114.]Search in Google Scholar
[2. Brunnemann, K. D., Louis Yu and D. Hoffmann: J. Anal.Toxicol.1 (1977) 38-42.10.1093/jat/1.1.38]Search in Google Scholar
[3. Vickroy, D. G., and George L. Gaunt, Jc.: Tob. Sci. 16 (1972) 22-25.]Search in Google Scholar
[4. Reif, H.: Fachliche Mitteilungen der Austria Tabakwerke AG No. 13, 1972, 220-224.]Search in Google Scholar
[5. Collins, P. F., N. M. Sarji and J. F. Williams: Tob. Sci.14 (1970) 12-15.]Search in Google Scholar
[6. Przybylowicz, E. P., and L. B. Rogers: Anal. Chem. 30 (1958) 65-68.10.1021/ac60133a018]Search in Google Scholar
[7. Aldridge, W. N.: Analyst 69 (1944) 262-265.10.1039/an9446900262]Search in Google Scholar
[8. Norman, V.: Beitr. Tabakforsch. 7 (1974) 282-287. ]Search in Google Scholar
