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101 0 $aeng
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200 1 $aSpectral theory of operators in Hilbert space$fK. O. Friedrichs
210   $aNew York$aHeidelberg$aBerlin$cSpringer-Verlag$d1973
215   $aVIII, 244 p.$d26 cm
225 2 $aApplied mathematical sciences$v0009
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610 1 $aMatematica$aTeorie
676   $a510.8$v20$9Matematica
700  1$aFriedrichs,$bKurt Otto$040614
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996   $aSpectral Theory of Operators in Hilbert Space$9342046
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