1. Larsen, L., Nielsen, J., and Sorensen, H., Phytochemistry, 1982, vol. 21, no. 5, p. 1029.
2. Harborne, J.B., Williams, C.A., and Harborne, J.B., London, 1988, p. 303.
3. Rice-Evans, C. and Parker, L., Flavonoids in Health and Diseases, New York: Dekker, 1998.
4. Magnani, L., Gaydou, E., and Hubaud, J., Anal. Chim. Acta, 2000, vol. 411, nos. 1–2, p. 209.
5. Shorina, N.V., Kosyakov, D.S., and Bogolitsyn, K.G., Zh. Prikl. Khim., 2005, vol. 78, no. 1, p. 27.