01010nam0-22003731i-450-99000398993040332120050611110651.03-540-20246-3000398993FED01000398993(Aleph)000398993FED0100039899320040112d2003----km-y0itay50------baengDEa---a---001yyOperator functions and localization of spectraM. I. Gil'BerlinSpringerc2003xiv, 256 p.24 cmLecture Notes in Mathematics1830PerturbazioniTeoria spettrale515.7221Gil,Mihail Iosifovic150731ITUNINARICAUNIMARCBK990003989930403321C-20-(183020141MA1MA147A1047G1030C15Operator functions and localization of spectra253263UNINA