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101 0 $aita
105   $ay-------001yy
200 1 $aAnalytic Perturbation Theory for Matrices and Operators$fH. Baumgartel
210   $aBasel$cBirkhauser Verlag$d1985
215   $a427 p.$d24 cm
225 1 $aOperator theory, advances and applications$v15
676   $a515.724
700  1$aBaumgärtel,$bHellmut$0348144
801  0$aIT$bUNINA$gRICA$2UNIMARC
901   $aBK
912   $a990000851110403321
952   $a02 28 D 29$b4968$fFINBN
959   $aFINBN
996   $aAnalytic Perturbation Theory for Matrices and Operators$9348474
997   $aUNINA
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