Document Zbl 0288.47009

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Sov. Phys., Dokl. 18, 165-167 (1973); translation from Dokl. Akad. Nauk SSSR 209, 66-69 (1973).

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scan of Zbl 0288.47009

47A40	Scattering theory of linear operators
47A55	Perturbation theory of linear operators

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