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Leningrad State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 25, No. 4, pp. 1–13, October–December, 1991.
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Naboko, S.N. Structure of the singularities of operator functions with a positive imaginary part. Funct Anal Its Appl 25, 243–253 (1991). https://doi.org/10.1007/BF01080076
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DOI: https://doi.org/10.1007/BF01080076