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Leningrad State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 24, No. 3, pp. 26–35, July–September, 1990.
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Naboko, S.N. Estimates in operator classes for a difference of functions, from the pick class, of accretive operators. Funct Anal Its Appl 24, 187–195 (1990). https://doi.org/10.1007/BF01077959
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DOI: https://doi.org/10.1007/BF01077959