1. Lundqvist, B. I.: Phys. kondens. Materie6, 193 (1967).
2. ——: Phys. kondens. Materie6, 206 (1967).
3. Schrieffer, J. R.: In: Theory of superconductivity, p. 146, for further references. New York: W. A. Benjamin Inc. 1964.
4. Hedin, L.: Phys. Rev.139, A 796 (1965).
5. Geldart, D. J. W., A. Houghton, andS. H. Vosko: Can. J. Phys.42, 1938 (1964).