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The Spectrum of a Harmonic Oscillator Operator Perturbed by $${\delta}$$ δ -Interactions

Crossref DOI link: https://doi.org/10.1007/s00020-016-2307-0

Published Online: 2016-07-29

Published Print: 2016-08

Update policy: https://doi.org/10.1007/springer_crossmark_policy