Davies, E.B. <br/><br/>
Spectral theory and differential operators / 
E.B. Davies. 
 - Cambridge :  Cambridge University Press,  1995. 
 - ix, 182 p. :  ill. ;  24 cm. 
<br/><br/>Includes bibliographical references. 
<br/><br/><label>ISBN: </label>0521472504 (hbk.) 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Spectral theory (Mathematics)<br/>Elliptic operators.
<br/><br/><label>Subjects--Index Terms: </label>Operators (Mathematics)