1. Plant Resources of the USSR, Vol. 1, Flowering Plants, Their Chemical Composition, Use, Families Magnoliaceae-Limoniaceae [in Russian], Nauka, Leningrad, 1985, p. 143.
2. M. D. Mashkovskii, Drugs [in Russian], Vol. 1, Meditsina, Tashkent, 1988, p. 339.
3. K. Ishimaru, G. I. Nonaka, and I. Nishioka, Phytochemistry, 26, 1167 (1987).
4. J. P. Salminen, T. Roslin, M. Karonen, J. Sinkkonen, K. Pihlaja, and P. Pulkkinen, J. Chem. Ecol., 30, 1693 (2004).
5. N. Vivas, M.-F. Nonier, I. Pianet, N. V. de Gaulejac, and E. Fouquet, C. R. Chim., 9, 120 (2006).