References
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Khatskevich V.A. Invariant Subspaces and Properties of the Spectrum of Plus-Operators with a Quasifocusing Power in a Krein Space. Funktsional. Anal. i Prilozhen., 1984, 18, N1 86–87 (in Russian).
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Dedicated to the good memory of Yuryi Lvovich Shmulian.