1. Gerhards, E., Gibian, H. (1968), Naturwissenschaften 55, 435.
2. Williams, K. I. H., Burstein, S. H., Layne, D. S. (1966), Arch. Biochem. Biophys. 117, 84.
3. Gerhards, E., Gibian, H., Raspe, G. (1965) Arzneim.Forsch. 15, 1295.
4. Hucker, H. B., Miller, J. K., Hochberg, A., Brobyn, R. D., Riordan, F. H., Calesnick, B. (1967), J. Pharm. Exp. Ther. 155, 309.
5. Dunham, J. R., Ward, G., Bassette, R., Reddy, M. C., Dairy, J. (1968) Science 51, 44.