1. J.C. Slater: Quantum theory of Matter, 5th ed. McGraw-Hill Book Company, New York (1985)
2. F. Bassani and U.M. Grassano: Fisica dello Stato Solido. 1st ed. Bollati Boringhieri, Torino (2000)
3. For a review, see e.g. W. Kohn, Rev. Mod. Phys. 71, 1253 (1999)
4. For a review, see e.g. N.H. March, in Theory of the inhomogeneous electron gas. ed. by S. Lundqvist and N.H. March. Plenum Press, New York (1983); S. Lundqvist, ibid
5. M.L. Chiofalo, S. Conti, and M.P. Tosi, Mod. Phys. Lett. B 8, 1207 (1994)