Description of the algebraic structure of second-order differential operators that can be represented in divergence form
2019 ◽
Vol 22
(02)
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pp. 1950010
2017 ◽
Vol 37
(4)
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pp. 4023-4054
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1995 ◽
pp. 429-467
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2006 ◽
Vol 08
(01)
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pp. 67-99
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1999 ◽
Vol 59
(1)
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pp. 227-251