1. Broughton, P. M. G.: A rapid ultraviolet spectrophotometric method for the detection, estimation and identification of barbiturates in biological material. Biochem. J. 63, 207 to 213 (1956)
2. Clarke, E. G. C.: Isolation and identification of drugs, pp. 569 and 594. London: The Pharmaceutical Press 1969
3. Freimuth, H. C.: Isolation and separation of poisons from biological material. In: Toxicology mechanisms and analytical methods, vol. 1 (ed. C. P. Stewart, A. Stolman), pp. 285?302. New York: Academic Press 1960
4. Gupta, R. N., Galdenzi, S., Keane, P. M.: The determination of plasma ethanol by gas liquid chromatography using trichloracetic acid as the protein precipitant. J. forens. Sci. 17, 453?455 (1972)
5. Rehling, C. J.: Poison residues in human tissues. In: Progress in chemical toxicology, Vol. 3 (ed. A. Stolman), pp. 363?386. New York: Academic Press