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200 1 $aPlane waves and spherical means$eapplied to partial differential equations$fFritz John.
210   $aNew York$cInterscience publishers$d1955
215   $aVIII, 172 p.$cill.$d23 cm
225 1 $aInterscience tracts in pure and applied mathematics$v2
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700  1$aJohn,$bFritz$0331219
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