1. Treatment of Airborne Radioactive Wastes, Proceeding of a Symposium, New York (1968).
2. L. N. Rozhdestvenskaya, A. G. Cherepov, B. R. Keier, Yu. V. Chechetkin, and V. D. Kizin, Zh. Fiz. Khim.,49, 1497 (1975).
3. K. M. Nikolaev and M. M. Dubinin, Izv. Akad. Nauk SSSR, Otd. Khim. Nauk,1958, 1165.
4. A. A. Fomkin, Dissertation, Moscow (1974).
5. R. M. Barrer and R. Papadopoulos, Proc. Roy. Soc. London,A326, 315, 1566 (1972).