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Quasidegenerate perturbation theories. A canonical van Vleck formalism and its relationship to other approaches
December 1980
December 1980
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Most cited references39
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On the Dirac Theory of Spin 1/2 Particles and Its Non-Relativistic Limit
Leslie Foldy, Siegfried Wouthuysen (1950)
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Derivation of the Brueckner Many-Body Theory
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Many-body perturbation theory, coupled-pair many-electron theory, and the importance of quadruple excitations for the correlation problem
George D Purvis, Rodney Bartlett (1978)