Davies, E.B <br/><br/>
Spectral theory & differential operators 
E.B. Davies 
 - Cambridge  Cambridge University Press  1995 
 - ix  182 
 - Cambridge studies in advanced mathematics 42 .
<br/><br/><label>ISBN: </label>9780521587105 
<br/><br/><label>Dewey Class. No.: </label>5.03+10.02  / DAVI