1. S. A. Baranov et al., Izv. Akad. Nauk SSSR, Ser. Fiz.,23, 1402 (1959).
2. A. Rytz, Atomic Data and Nuclear Data Tables, No. 12, 479 (1973).
3. A. G. Zelenkov et al., At. Energ., this issue, 405.
4. R. Barnes et al., J. Inorg. Nucl. Chem.,9, 105 (1959).
5. C. Lederer, J. Hollander, and I. Perlman, Table of Isotopes, Sixth Ed., Wiley, New York-London-Sydney (1967).