Ray Theory. Media of Variable Velocity
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1995 ◽
Vol 34
(Part 1, No. 5B)
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pp. 2940-2942
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1989 ◽
Vol 86
(2)
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pp. 771-776
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1999 ◽
Vol 386
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pp. 329-344
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1999 ◽
Vol 35
(3)
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pp. 1594-1597
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