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T. Ya. Azizov, “A condition for the nondegeneracy of the closed linear hull of the root vectors of Jdissipative completely continuous operators in the Pontryagin space νχ,” in: Collected Works of Research Students, Faculty of Mathematics, Vol. 1, Voronezh State Univ. (1971), pp. 1–5.
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 30, No. 1, pp. 86–88, January–February, 1978.
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Azizov, T.Y., Usvyatsova, E.B. Completeness and the basis property of the eigen- and associated vectors of operators of the class K (H). Ukr Math J 30, 63–64 (1978). https://doi.org/10.1007/BF01130632
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DOI: https://doi.org/10.1007/BF01130632