On the discreteness of the spectrum of non-self-adjoint periodic boundary-value problems
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Publication:1214049
DOI10.1007/BF00968285zbMath0297.35057MaRDI QIDQ1214049
Publication date: 1974
Published in: Siberian Mathematical Journal (Search for Journal in Brave)
General topics in linear spectral theory for PDEs (35P05) Schrödinger operator, Schrödinger equation (35J10)
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