scientific article; zbMATH DE number 3205641
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Publication:5333569
zbMath0126.31701MaRDI QIDQ5333569
Publication date: 1963
Full work available at URL: http://mathnet.ru/eng/izv/v27/i3/p677
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The spectrum of non-self-adjoint perturbations of abstract differential operators ⋮ The spectra of non-elliptic operators
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