1. R. D. H. Murray, J. Mendez, and S. A. Brown, The Natural Coumarins, J. Wiley, Chichester, 1982, 702 pp.
2. R. D. H. Murray, The Naturally Occurring Coumarins. Progress in the Chemistry of Organic Natural Products, Springer-Verlag, Wien, 2002, 83, 673 pp.
3. I. V. Nagorichna, I. P. Dubovik, M. M. Garazd, and V. P. Khilya, Khim. Prirod. Soedin., 2003, 196 [Chem. Nat. Compd., 2003 (Engl. Transl.)].
4. M. D. Mashkovskii, Lekarstvennye sredstva [Drugs], 14th ed., Novaya Volna, Moscow, 2001, 2, 223 (in Russian).
5. H. Yuan and A. L. Parrill, Bioorg. Med. Chem., 2002, 10, 4169.