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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 28, No. 3, pp. 293–299, May–June, 1976.
In conclusion, I would like to express my gratitude to I. S. Iokhvidov for his interest in this research.
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Azizov, T.Y. Invariant subspaces of commutative families of operators in a space with an indefinite metric. Ukr Math J 28, 229–233 (1976). https://doi.org/10.1007/BF01089168
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DOI: https://doi.org/10.1007/BF01089168