1. Shanghai Science and Technological Publisher:“The dictionary of Chinese drugs” (Zhong Yao Da Ci Dian), Vol. 2, Shougakukan, Tokyo, p. 1103 1985).
2. Kim, M. S., Bae, J. M., Park, H. J., Chung, H. Y., Young, H. S., Choi, J. S. and Park, K. Y.: Separation of antimutagenic substance from stembark ofCatalpa ovata. The Kor. J. Toxicology, submitted (1992).
3. Hiramoto, M. and Yatanabe, K.: The constituents ofCatalpa ovata. G. Don.Yakugaku Zasshi,59, 261 (1939)(CA,34, 1006 (1940)).
4. Inouye, H., Okuda, T. and Hayashi, T.: Quinones and related compounds in higher plants. II. On the naphthoquinones and related compounds fromCatalpa wood.Chem. Pharm. Bull.,23, 384 (1975).
5. Inoue, K., Shiobara, Y., Chen, C. C., Sakuyama, S. and Inouye, H.: Quinones and related compounds in higher plants. VII. Supplementary studies on the constituents of the wood ofCatalpa ovata.Yakugaku Zasshi,99, 500 (1979).