1. R.D.H. Murray et al., Springer-Verlag, New York, 58 84 (1991).
2. K. Padmawinata et al., Acta Pharm, 40 1 (1973).
3. Biological Activity of Some Coumarins from Sri Lankan Rutaceae
4. J.R. Johnson, Org React, 1 210 (1942).
5. S. Sethna and R. Phadke, Org React, 7 1 (1953).