1. R. D. H. Murray, J. Méndez, S. A. Brown, The Natural Coumarins, Occurrence, Chemistry and Biochemistry, John Wiley & Sons Ltd., Chichester, 1982.
2. B. Bridges, G. Strauss, Nature283, 523 (1980).
3. O. Schimmer, R. Beck, U. Dietz, Planta Med.40, 68 (1980).
4. O. Schimmer, Planta Med.47, 79 (1983).
5. E. Fahr, Pharm. Ztg.127, 163 (1982).