1. A. K. Krasin, et al., ?Physical Investigations?. Moscow, Published by Akad. Nauk SSSR (1955) p. 142. (Report of the Soviet delegation to the International Conference on the Peaceful Uses of Atomic Energy, Geneva, 1955) [in Russian].
2. A. V. Antonov, et al., As above, p. 158.
3. D. J. Hughes, Pile Neutron Research Moscow, IL [Russian translation (1954).
4. G. de Saussure and Silver, Report ORNL-2641 (1959).
5. K. BecKurts, Nucl. Instrum. and Methods,11, 144 (1961).