1. V. I. Kalashnikova et al., Session of the Academy of Sciences of the USSR on the Peaceful Uses of Atomic Energy [in Russian], Otd. Fiz.-Matem. Nauk, Izd. AN SSSR, Moscow (1955), p. 156.
2. R. Leachman, Phys. Rev.,101, 1005 (1956).
3. R. Leachman, Proc. Second Internat. Conf. Peaceful Uses of Atomic Energy, Vol. 15, New York (1958), p. 229.
4. I. Bondarenko et al, ibid., p. 353.
5. A. Moat, D. Mather, and P. Fieldhouse, Proc. Seminar on the Physics of Fast and Intermediate Reactors, Vol. 1, IAEA, Vienna (1961), p. 139; I. Bondarenko, ibid. Proc. Seminar on the Physics of Fast and Intermediate Reactors, Vol. 3, IAEA, Vienna (1961), p. 451.