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Perdew, J. P.; McMullen, E. R.; Zunger, Alex (1981). Density-functional theory of the correlation energy in atoms and ions: A simple analytic model and a challenge. Phys. Rev. A. 23 (6): 2785—2789. Bibcode:1981PhRvA..23.2785P. doi:10.1103/PhysRevA.23.2785.