A FOURTH ORDER ACCURATE FAST DIRECT METHOD FOR THE HELMHOLTZ EQUATION
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1995 ◽
Vol 74
(6)
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pp. 1371-1376
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1979 ◽
Vol 24
(2)
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pp. 149-156
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1987 ◽
Vol 13
(3)
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pp. 221-234
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1964 ◽
Vol 4
(4)
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pp. 208-211
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1989 ◽
Vol 10
(1)
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pp. 58-71
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