On the Riesz basis property of the root functions in certain regular boundary value problems
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2006 ◽
Vol 42
(12)
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pp. 1717-1728
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1999 ◽
Vol 197
(1)
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pp. 157-187
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2019 ◽
Vol 42
(18)
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pp. 6733-6740
Keyword(s):
2013 ◽