On the eigenvalues of a polyharmonic matrix operator near diffraction planes
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1997 ◽
Vol 37
(6)
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pp. 1095-1100
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2018 ◽
Vol 33
(3)
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pp. 521-536
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2010 ◽
1964 ◽
Vol 43
(1-4)
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pp. 332-335
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2014 ◽
Vol 144
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pp. 49-67
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