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Translated from Matematicheskie Zametki, Vol. 24, No. 2, pp. 241–248, August, 1978.
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Frolov, N.N. Essential self-adjointness of an infinite-dimensional operator. Mathematical Notes of the Academy of Sciences of the USSR 24, 630–634 (1978). https://doi.org/10.1007/BF01105317
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DOI: https://doi.org/10.1007/BF01105317