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HerrnLudwig Biermann zum 60. Geburtstag am 13. März 1967 gewidmet
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Jörgens, K. Zur Spektraltheorie der Schrödinger-Operatoren. Math Z 96, 355–372 (1967). https://doi.org/10.1007/BF01117096
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DOI: https://doi.org/10.1007/BF01117096