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The relative importance of vxc and fxc in response calculations is discussed in van Gisbergen et al. Phys. Rev. A57 2556-71 (1998) and references therein. In that paper exact vxc's were used in combination with the ALDA for fxc. The good results which were obtained formed a motivation for finding new models for vxc which were suitable for response property calculations. The asymptotic -1/r behavior is very important, for example.

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