1. L. Wall, R. Donadio, and W. Pummer, J. Amer. Chem. Soc.,82, 4846 (1960).
2. I. L. Knunyants and A. V. Fokin, Conquest of the Impregnable Element [in Russian], Moscow, Izd. AN SSSR, p. 4 (1963).
3. F. Bloch and D. Mackenzie, Radiation Stability of Some Liquid Fluorocarbon Systems at Elevated Temperatures, Meeting of American Nuclear Society, San Francisco (1964).
4. J. Simons and E. Taylor, J. Phys. Chem.,63, 636 (1959).
5. D. Mackenzie, F. Bloch, and R. Wiswall, J. Phys. Chem.,69, 2526 (1965).