1. B. N. Brockhouse, G. A. Dewitt, E. D. Hallman andJ. M. Rowe:Neutron inelastic scattering, in Proceedings of the International Symposium IV, Vol.2 (Copenhagen, 1968), p. 259.
2. S. K. Joshi andA. K. Rajgopal:Solid State Physics, edited byF. Seitz andA. Turnbull, Vol.22 (New York, N. Y., 1968), p. 159.
3. R. Ohrlich andW. Drextel:Neutron inelastic scattering, inProceedings of the International Symposium IV, Vol.1 (Copenhagen, 1968), p. 203.
4. D. H. Dutton, B. N. Brockhouse andA. P. Miller:Canad. Journ. Phys.,50, 2915 (1972).
5. R. A. Reese, S. K. Sinha andD. T. Peterson:Phys. Rev. B,8, 1332 (1973).