1. Krantz, J. C., and Rudo, F. G., Handbook of Experimental Pharmacology, XX/I (edit. by Smith, F. A.), 501–564 (Springer, Berlin, 1966).
2. Larsen, E. R., Fluorine Chem. Rev., 3, 1 (1969).
3. Clayton, J. W., Fluorine Chem. Rev., 1(2), 197 (1967).
4. Meyer, H., and Hemmi, H., Biochem. Z., 277, 39 (1935).
5. Seeman, P., Pharmac. Rev., 24, 583 (1972).