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Dedicated to Tosio Kato on the occasion of his seventieth birthday
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Hempel, R., Hinz, A.M. & Kalf, H. On the essential spectrum of Schrödinger operators with spherically symmetric potentials. Math. Ann. 277, 197–208 (1987). https://doi.org/10.1007/BF01457359
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DOI: https://doi.org/10.1007/BF01457359