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100   $a20000920d1985----km-y0itay50------ba
101 0 $aeng
200 1 $aAnalytic pertubation theory for matrices and operators$fby Baumgartel.
210   $aBasel [etc.]$cBirkhauser$d1985
225 1 $aOperator theory, advances and applications$v15
700  1$aBaumgärtel,$bHellmut$0348144
801  0$aIT$bUNINA$gRICA$2UNIMARC
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996   $aAnalytic pertubation theory for matrices and operators$9345505
997   $aUNINA
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