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200 1 $a<<A >>Short Introduction to Perturbation Theory for Linear Operators$fby >Kato
210   $aNew York [etc.]$cSpringer-Verlag$d198
610 0 $aTeoria della perturbazione
610 0 $aTeoria degli operatori
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996   $aShort introduction to perturbation theory for linear operators$934040
997   $aUNINA