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Additional information
Odessa Engineering-Construction Institute. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 3, No. 1, pp. 89–90, January–March, 1969.
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Krein, M.G. Angular localization of the spectrum of a multiplicative integral in a Hilbert space. Funct Anal Its Appl 3, 73–74 (1969). https://doi.org/10.1007/BF01078278
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DOI: https://doi.org/10.1007/BF01078278