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After this manuscript was prepared we were shown a preprint byH. Ehrenerich andM. H. Cohen (Submitted toPhys. Rev.) which also discusses this method and its application to solidstate physics. We should also point out that many of the concepts used by us were previously discussed byJ. Lindhard:Dan. Mat. Fys. Medd.,28, no. 8 (1954).
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A. E. Glassgold, W. Heckrotte andK. M. Watson:Ann. Phys.,6, 1 (1959).
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Goldstone, J., Gottfried, K. Collective excitations of fermi gases. Nuovo Cim 13, 849–852 (1959). https://doi.org/10.1007/BF02726371
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DOI: https://doi.org/10.1007/BF02726371