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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 37, No. 3, pp. 361–363, May–June, 1985.
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Ismailov, Z.I. A description of all the proper operators (soluble extensions) for first-order differential equations in Hilbert space. Ukr Math J 37, 285–287 (1985). https://doi.org/10.1007/BF01059613
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DOI: https://doi.org/10.1007/BF01059613