Abstract
Variational techniques for the calculation of upper bounds to excitedstate energies are proposed. Further, upper bounds can be obtained by means of lower bounds to the energies of the low-lying states.
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Englisch, H., Englisch, R. Upper bounds to excited-state energies. Few-Body Systems 3, 1–6 (1987). https://doi.org/10.1007/BF01080940
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DOI: https://doi.org/10.1007/BF01080940