Literature cited
M. A. Krasnosel'skii, “Self-adjoint extensions of Hermitian operators,” Ukr. Mat. Zh., No. 1, 21–38 (1949).
E. R. Tsekanovskii and Yu. L. Shmul'yan, “Questions of the theory of extensions of unbounded operators in normalized Hilbert spaces,” in: Mathematical Analysis [in Russian], Vol. 14, Itogi Nauki i Tekhniki, VINITI Akad.NaukSSSR, Moscow (1977), pp. 59–100.
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 33, No. 6, pp. 810–814, November–December, 1981.
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Kuzhel', A.V., Rudenko, L.I. Regular extensions of Hermitian and isometric operators. Ukr Math J 33, 612–615 (1981). https://doi.org/10.1007/BF01085439
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DOI: https://doi.org/10.1007/BF01085439