1. Alm, S. et al., Simultaneous gas chromatographic analysis of drugs of abuse on two fused silica columns of different polarity, J. Chromatogr., 254, 179, 1983.
2. Bailey, M.A., The value of the Duquenois test for cannabis – a survey, J. Forens. Sci., 24, 817, 1979.
3. Baker, P.B. and Phillips, C.F., The forensic analysis of drugs of abuse, Analyst, 108, 777, 1983.
4. Balinger, J.T. and Shugar, G.J., Chemical Technician’s Ready Reference Handbook, 3rd ed., 1990.
5. Bartle, K.D., Lee, M.L., and Yang, F.J., Open Tubular Column Gas Chromatography, Wiley, New York, 1984.