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Dedicated with respect to I. M. Gel'fand on the occasion of his sixtieth birthday.
Odessa State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 7, No. 4, pp. 1–16, October–December, 1973.
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Adamyan, V.M. Nondegenerate unitary couplings of semiunitary operators. Funct Anal Its Appl 7, 255–267 (1973). https://doi.org/10.1007/BF01075730
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DOI: https://doi.org/10.1007/BF01075730