A. M. Sidorov, “Eigenvalues and eigenvectors of a perturbed operator”, Issled. Prikl. Mat., 1989, Issue 16,Pages <nobr>131–138</nobr>

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Issled. Prikl. Mat., 1989 Issue 16, Pages 131–138 (Mi kuipm74)

Eigenvalues and eigenvectors of a perturbed operator

A. M. Sidorov

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English version: Journal of Soviet Mathematics, 1992, 61:6, 2476–2480

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