1. L. Usachev, J. Nucl. Eng., A/B,18, 371 (1964).
2. L. N. Usachev and Yu. G. Bobkov, in: Proc. Conf. ?Neutron Physics?, [in Russian], Part I, Naukova Dumka, Kiev (1972), p. 47.
3. Yu. G. Bobkov et al., in: Proc. Conf. ?Neutron Physics?, [in Russian], Part I, Izd. TsNIIatominform, Moscow (1976), p. 76.
4. R. Conn and W. Stacey, Nucl. Fusion,13, 185 (1973).
5. S. Gerstl, D. Dudziak, and D. Muir, Nucl. Sci. Eng.,62(1), 137 (1977).