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Additional information
I. Franko L'vov State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 22, No. 1, pp. 73–74, January–March, 1988.
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Mikityuk, Y.V. Uniqueness theorems for analytic operator-valued functions with nonnegative imaginary part. Funct Anal Its Appl 22, 62–64 (1988). https://doi.org/10.1007/BF01077729
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DOI: https://doi.org/10.1007/BF01077729