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100   $a20020821d1984----km-y0itay50------ba
101 0 $aeng
105   $aa-------001yy
200 1 $aPerturbation theory for linear operators$fTosio Kato
205   $a2nd corrected printing of the 2nd ed.
210   $aBerlin ; Heidelberg$cSpringer-Verlag$d1984
215   $a619 p.$cill.$d23 cm
225 1 $a<<Die >>Grundlehren der mathematischen Wissenschaften$v132
610 0 $aOperatori lineari$aPerturbazione (Matematica)
676   $a515.724'6
700  1$aKato,$bTosio
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