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Additional information
Moscow Municipal Civil Transport Administration. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 13, No. 3, pp. 77–78, July–September, 1979.
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Gordon, A.Y. Continuous spectrum of a one-dimensional Schrödinger operator. Funct Anal Its Appl 13, 218–220 (1979). https://doi.org/10.1007/BF01077492
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DOI: https://doi.org/10.1007/BF01077492