1. O. V. Khilya, O. V. Shablykina, M. S. Frasinyuk, A. V. Turov, V. V. Ishchenko, and V. P. Khilya, Khim. Geterotsikl. Soedin., 1632 (2004). [Chem. Heterocycl. Compd., 40, 1408 (2004).]
2. F. Borges, F. Roleira, N. Milhazes, L. Santana, and E. Uriarte, Curr. Med. Chem., 12, 887 (2005).
3. T. Ojala, Acad. Diss., Helsinki (2001); http://ethesis.helsinki.fi/julkasut-/mat/farma/vk/ojala/biologic.pdf
4. J. B. Harborne and H. Baxter (editors), Handbook of Natural Flavonoids, Wiley(1999).
5. R. D. H. Murray, Nat. Prod. Rep., 12, 477 (1995).