Some problems of the spectral theory of a second-order differential equation with a variable unbounded operator coefficient
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Publication:1220628
DOI10.1007/BF01149802zbMath0314.34056WikidataQ115394010 ScholiaQ115394010MaRDI QIDQ1220628
Publication date: 1975
Published in: Mathematical Notes (Search for Journal in Brave)
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