Literature cited
T. Ya. Azizov, “Spectra of certain classes of operators in Hilbert space,” Matem. Zametki,9, No. 3, 303–310 (1971).
I. S. Iokhvidov, “On some classes of operators in a space with a general indefinite metric,” in: Functional Analysis and Its Application [in Russian], Baku (1961), pp. 90–95.
T. Ya. Azizov and I. S. Iokhvidov, “Linear operators in Hilbert spaces with a G-metric,” Uspekhi Matem. Nauk,26, No. 4(160), 43–92 (1971).
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Translated from Matematicheskie Zametki, Vol. 13, No. 5, pp. 783–784, May, 1973.
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Shmul'yan, Y.L. Letter to the editor. Mathematical Notes of the Academy of Sciences of the USSR 13, 467 (1973). https://doi.org/10.1007/BF01147479
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DOI: https://doi.org/10.1007/BF01147479