1. Curtis, D. R., and Johnston, G. A. R., Ergebn. Physiol., 69, 97 (1974).
2. Eugster, C. H., in Ethnopharmacologic Search for Psychoactive Drugs (edit. by Efron, D. H., Holmstedt, B., and Kline, N. S.), 416 (US Public Health Service Publication No. 1645, 1967).
3. Ueno, Y., Nawa, H., Ueyanagi, J., Morimoto, H., Nakamori, R., and Matsuoka, T., J. pharm. Soc. Japan, 75, 807 (1955).
4. Murayama, K., Morimura, S., Nakamura, Y., and Sunagawa, G., J. pharm. Soc. Japan, 85, 757 (1965).
5. Johnston, G. A. R., Curtis, D. R., De Groat, W. C., and Duggan, A. W., Biochem. Pharmac., 17, 2488 (1968).