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100   $a20040112d2003----km-y0itay50------ba
101 1 $aeng
102   $aDE
105   $aa---a---001yy
200 1 $aOperator functions and localization of spectra$fM. I. Gil'
210   $aBerlin$cSpringer$dc2003
215   $axiv, 256 p.$d24 cm
225 1 $aLecture Notes in Mathematics$v1830
610 0 $aPerturbazioni
610 0 $aTeoria spettrale
676   $a515.72$v21
700  1$aGil,$bMihail Iosifovic$0150731
801  0$aIT$bUNINA$gRICA$2UNIMARC
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996   $aOperator functions and localization of spectra$9253263
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