On the discrete spectrum of periodic differential operators with a distant perturbation
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Publication:352187
DOI10.1134/S106456241301016XzbMath1275.47099MaRDI QIDQ352187
Publication date: 4 July 2013
Published in: Doklady Mathematics (Search for Journal in Brave)
Perturbation theory of linear operators (47A55) General theory of partial differential operators (47F05) Higher-order elliptic equations (35J30)
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