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3. N. H. March, in Orbital Theories of Molecules and Solids, N. H. March, ed., pp. 95–122 (Clarendon Press, Oxford, 1974).
4. A. K. Rajagopal, in Advances in Chemical Physics, I. Prigogine and S. A. Rice, eds., Vol. 41, pp. 59–193 (Wiley, New York, 1980).
5. B.I. Lundqvist, H. Hjelmberg, and O. Gunnarsson, in Photoemission and the Electronic Properties of Surfaces, B. Feuerbacher, B. Fitton, and R. F. Willis, eds., pp. 227–278 (Wiley, New York, 1978).