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100   $a20020821d1995----km-y0itay50------ba
101 0 $aeng
105   $ay-------001yy
200 1 $aSpectral theory and differential operators$fE.B. Davies
210   $aCambridge$cCambridge University Press$dc1995
215   $aIX, 182 p.$cill.$d23 cm
225 1 $aCambridge studies in advanced mathematics$v42
676   $a515.724 2$v20$zita42
700  1$aDavies,$bEdward Brian$051945
801  0$aIT$bUNINA$gRICA$2UNIMARC
901   $aBK
912   $a990000406580403321
952   $a04 011-56$b2794$fDINCH
959   $aDINCH
996   $aSpectral theory and differential operators$9134668
997   $aUNINA