Absolute continuity of the essential spectrum of $$ - \frac{{d^2 }}{{dt^2 }} + q(t)$$ without monotony ofq
2021 ◽
Vol 145
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pp. 130-162
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2020 ◽
Vol 54
(2)
◽
pp. 145-148
2005 ◽
Vol 7
(2)
◽
pp. 164-178
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2008 ◽
Vol 18
(01)
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pp. 219-225
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