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Second-order MCSCF theory is presented in a fashion which is capable of treating large CI expansions. This formalism is then extended to encompass a state-average MCSCF procedure. Sample calculations on Mo2 and the ethyl radical, which involve 1698 and 2302 CSFs, respectively, are presented and a number of approximate schemes discussed.
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Byron H. Lengsfield (1982) studied this question.
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