On smoothness property of third-order differential operator
2020 ◽
Vol 31
(4)
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pp. 585-606
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1975 ◽
Vol 72
(4)
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pp. 299-305
2015 ◽
Vol 13
(2)
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pp. 687-701
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2020 ◽
Vol 08
(12)
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pp. 2861-2868
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Keyword(s):