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Publication:3743889
zbMath0605.47012MaRDI QIDQ3743889
Publication date: 1986
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Perturbation theory of linear operators (47A55) Linear symmetric and selfadjoint operators (unbounded) (47B25) Linear operators on spaces with an indefinite metric (47B50)
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