1. W. Kohn and P. Vashishta, in: Theory of the Inhomogeneous Electron Gas ( S. Lundqvist and N. H. March, eds.), Plenum, New York (1983).
2. N. D. Lang, in: Solid State Physics (F. Seitz, D. Turnbull, and H. Ehrenreich, eds.), Vol. 28, p. 225, Academic Press, New York (1973).
3. P. Hohenberg and W. Kohn, Phys. Rev. 136, B864 (1964).
4. W. Kohn and L. J. Sham, Phys. Rev. 140, A1133 (1965).
5. E. Wigner and J. Bardeen, Phys. Rev. 48, 84 (1935).