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"Accurate exchange-correlation potential for silicon and its discontinuity on addition of an electron", R.W. Godby, M. Schl¨¹ter and L.J. Sham, Phys. Rev. Lett. 56  2415 (1986)
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"Self-energy operators and exchange-correlation potentials in semiconductors", R.W. Godby, M. Schl¨¹ter and L.J. Sham, Phys. Rev. B 37 10159 (1988).
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