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The perturbational approach to the Dirac-Coulomb equation recently developed by Rutkowski and Jankowski (1987) is applied to the calculation of the energy at the first-order Hartree-Fock level for closed-shell atoms ranging from He up to XE. The results obtained closely resemble the energies calculated within the quasirelativistic approach and for small atomic numbers are in very good agreement with the DHF results.
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Rutkowski et al. (1988) studied this question.
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