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    • coupling constant thresholds of perturbed periodic Hamiltonians 

      Fassari, S.; Klaus, M. (AIP Publishing, 1998-09)
      We consider Schrodinger operators of the form H-lambda= -Delta + V + lambda W on L-2(R-v) (v=1, 2, or 3) with V periodic, W short range, and lambda a real non-negative parameter. Then the continuous spectrum of H-lambda ...