1. D. J. Donahue and C. S. Young, TID 12093 p. 240.
2. The nuclear resonant scattering of neutron capture gamma-rays
3. B. Arad (Huebschmann), G. Ben-David (Davis), I. Pelah and Y. Schlesinger IA 863, also Phys. Rev. (in press).
4. ISPRA Report, DPR-212 (EUR/C-IS/1731/62).