1. W. S. Kan, Manual of Medicinal Plants in Taiwan, National Research Institute of Chinese Medicine, Taiwan, 1971, p. 246.
2. Y. C. Wu and F. R. Chang, J. Chin. Chem. Soc., 53, 76 (1995).
3. F. R. Chang, C. Y. Chen, P. H. Wu, R. Y. Kuo, Y. C. Chang, and Y. C. Wu, J. Nat. Prod., 63, 746 (2000).
4. C. K. Lee, P. H. Lee, and Y. H. Kuo, J. Chin. Chem. Soc., 48, 1053 (2001).
5. I. L. Tsai, Y. F. Jeng, B. Jayaprakasam, and I. S. Chen, Chin. Pharm. J., 53, 291 (2001).