1. G. V. Muradyan, Yu. V. Adamchuk, and Yu. G. Shchepkin, Problems in Atomic Science and Technology, Ser. Some Problems in the Physics of Solids [in Russian], Moscow (1974), p. 52.
2. W. Ponitz, Z. Phys.,197, 262 (1966).
3. G. V. Muradyan et al., Preprint IAÉ-2634, Moscow (1976).
4. Yu. V. Adamchuk et al. in: Neutron Physics. Proceedings of the 4th All-Union Conference [in Russian], Part 3, TsNIIatominform (1977), p. 113.
5. Yu. V. Adamchuk et al., ibid.in: Neutron Physics. Proceedings of the 4th All-Union Conference [in Russian], Pt. 2 (1977), p. 192.