1. Alexander, J., Benford, D., and Cockburd, A., EFSA J., 2008, vol. 691, p. 2.
2. Yakovlev, G.P., Lekarstvennoe syr’e rastitel’nogo i zhivotnogo proiskhozhdeniya. Farmakognoziya (Pharmaceutical Raw Material of Herbal and Animal Origin), St. Petersburg: SpetsLit, 2006.
3. Gosudarstvennaya farmakopeya SSSR: Vyp. 2 (USSR State Pharmacopoeia: Issue 2), Moscow: Meditsina, 1989, p. 400.
4. Steenkamp, P.A., Harding, N.M., van Heerden, F.R., and van Wyk, B.-E., Forensic Sci. Int., 2004, vol. 145, p. 31.
5. British Pharmacopoeia, vol. 3, London: Crown Copyright, 2008, p. 3042.