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Additional information
Leningrad State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 18, No. 1, pp. 16–27, January–March, 1984.
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Naboko, S.N. Conditions for similarity to unitary and self-adjoint operators. Funct Anal Its Appl 18, 13–22 (1984). https://doi.org/10.1007/BF01076357
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DOI: https://doi.org/10.1007/BF01076357