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2. see e. g. C. Kittel,Introduction to Solid State Physics, (Wiley, 1971).
3. J. Lindhard, Kgl. Danske Videnskab. Selskab. Mat.-fys. Medd.28, No. 8 (1954).
4. P. F. Meier, HPA48, 227 (1975).
5. P. Hohenberg, W. Kohn, Phys. Rev.136, B 864 (1964).