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Additional information
Leningrad Higher Military-Engineering Construction School. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 23, No. 3, pp. 84–85, July–September, 1989.
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Rybkin, A.V. The discrete and the singular spectrum in the trace formula for contracting and unitary operators. Funct Anal Its Appl 23, 244–246 (1989). https://doi.org/10.1007/BF01079541
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DOI: https://doi.org/10.1007/BF01079541