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We discuss implementation of cubic contributions in multiconfigurational self-consistent field (MCSCF) calculations. We explicitly demonstrate that, far from convergence, an iterative cubic technique can often eliminate the need for constraint procedures. Chebyshev (perturbative) and recursive (two-point fixed Hessian) cubic techniques are shown to be useful for local, but not global convergence.
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Olsen et al. (1982) studied this question.
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