1. J. C. Slater, Insulators, Semiconductors, and Metals, McGraw-Hill, New York (1967).
2. W. A. Harrison, Solid State Theory, McGraw-Hill, New York (1970).
3. A. Animalu, Intermediate Quantum Theory of Crystalline Solids, Prentice-Hall (1977).
4. A. K. Rajagopal, Adv. Chem. Phys.,41, 59 (1980).
5. V. L. Moruzzi, J. F. Janak, and A. R. Williams, Calculated Electronic Properties of Metals, Pergamon Press, New York (1978).