Oblique derivative problem with variable inclination angle: Location of the spectrum and the absence of the basis property of the system of root functions
2011 ◽
Vol 47
(10)
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pp. 1482-1489
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2018 ◽
Vol 54
(10)
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pp. 1399-1402
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2015 ◽
Vol 51
(10)
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pp. 1249-1266
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1996 ◽
Vol 51
(6)
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pp. 1220-1222
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