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Translated from Matematicheskie Zametki, Vol. 28, No. 6, pp. 833–842, December, 1980.
The author would like to thank A. N. Kochubei for some useful discussions.
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Vainerman, L.I. Extensions of closed operators in Hilbert space. Mathematical Notes of the Academy of Sciences of the USSR 28, 871–875 (1980). https://doi.org/10.1007/BF01709148
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DOI: https://doi.org/10.1007/BF01709148