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200 1 $aIntroduction to spectral theory in Hilbert space$fby HELMBERG G.
210   $aAmsterdam [etc.]$cNorth-Holland$d1969
225 1 $aNorth-Holland series in applied mathematics and mechanics
300   $aVOLUME 6
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996   $aIntroduction to Spectral Theory in Hilbert Space$9354863
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