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Reference14 articles.
1. See,e.g.,H. Raether:Solid state excitations by electrons, inSpringer Tracts in Modern Physics, Vol.38 (Berlin, 1965).
2. J. J. Hopfield:Phys. Rev.,139, A 419 (1965).
3. C. J. Pethick:Phys. Rev. B,2, 1789 (1970).
4. N. H. March andM. P. Tosi:Proc. Roy. Soc. (in press).
5. D. Bohm andD. Pines:Phys. Rev.,92, 609 (1953).