00902nam0-22003011i-450-99000040658040332120041129092415.00-521-58710-7000040658FED01000040658(Aleph)000040658FED0100004065820020821d1995----km-y0itay50------baengy-------001yySpectral theory and differential operatorsE.B. DaviesCambridgeCambridge University Pressc1995IX, 182 p.ill.23 cmCambridge studies in advanced mathematics42515.724 220ita42Davies,Edward Brian51945ITUNINARICAUNIMARCBK99000040658040332104 011-562794DINCHDINCHSpectral theory and differential operators134668UNINA