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On the Riesz basis property of systems of eigenelements and associated elements of differential equations with operator coefficients. (English. Russian original) Zbl 0643.47021

Sov. Math., Dokl. 35, 349-351 (1987); translation from Dokl. Akad. Nauk SSSR 293, 538-540 (1987).
Reviewer: Wen Lizhi
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