scientific article; zbMATH DE number 3590898
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Publication:4159854
zbMath0379.47007MaRDI QIDQ4159854
Publication date: 1978
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Spectrum, resolvent (47A10) Perturbation theory of linear operators (47A55) General theory of partial differential operators (47F05)
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