1. E. Segre, Phys. Rev., 86, 21 (1952).
2. V. P. Perelygin, S. P. Tret'yakova, and I. Zvarya, Preprint, Dubna (1963), No. 323.
3. K. Glover and P. Borrell, J. Nucl. Energy,1, 214 (1955).
4. G. Choppin et al., J. Inorg. and Nucl. Chem.,2, 66 (1956).
5. S. S. Bugorkov et al., Pribory i tekhnika éksperimenta, No. 4, 16 (1957).