1. T. S. Belanova, Zhur. Éksp. i Teoret. Fiz.34, 574 (1958).
2. A. I. Leipunskii. et al., Proceedings of the Second International Conference on the Peaceful Uses of Atomic Energy (Geneva, 1958). Communication of Soviet Scientists. Nuclear Physics, [in Russian] (Atomizdat, Moscow, 1959) Vol. 1, p. 136.
3. R. Nobles, et al., Rev. Scient. Instrum.25, 334 (1954).
4. P. I. Vatset, S. G. Tonapetyan, and G. A. Dorofeev, Atomnaya Énerg.7, 2, 172 (1959).
5. D. Hughes and R. Schwartz. NeutronCross Sections (New York, 1958).