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There are several forms of correlation:
* Wigner <ref name=wigner>{{cite journal | title = On the Interaction of Electrons in Metals | author = E. Wigner | journal = Phys. Rev. | volume = 46 | pages = 1002 - 1011 | year = 1934 | url = http://link.aps.org/abstract/PR/v46/p1002 | doi = 10.1103/PhysRev.46.1002 }}</ref><ref>{{cite journal | title = Theory of Metal Surfaces: Charge Density and Surface Energy | author = N. D. Lang and W. Kohn | journal = Phys. Rev. B | volume = 1 | pages = 4555 - 4568 | year = 1970 | url = http://link.aps.org/abstract/PRB/v1/p4555 | doi = 10.1103/PhysRevB.1.4555 }}</ref>
* Vosko-Wilk-Nusair (VWN) <ref>{{cite journal | title = Accurate spin-dependent electron liquid correlation energies for local spin density calculations: a critical analysis | author = S. H. Vosko, L. Wilk and M. Nusair | journal = Can. J. Phys. | volume = 58 | pages = 1200 | year = 1980 }}</ref>
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