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The uncoupled theory of Genkin and Mednis [Sov. Phys. JETP 27, 609 (1968)] for the nonlinear optical properties of infinite periodic systems has been extended to yield a fully analytical coupled perturbed Hartree–Fock treatment. Similarities and differences from other approaches to the same problem are analyzed. Future addition of electron correlation and vibrational contributions is discussed.
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Kirtman et al. (2000) studied this question.
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