Levitan B M <br/><br/>
Introduction to spectral theory: 

 -  1975 
 - xi,525p.  cm. 
 - Translations of Mathematical Monographs .
<br/><br/> Includes bibliography 
<br/><br/><label>Standard No.: </label>24659 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Differential operators
<br/><br/><label>Dewey Class. No.: </label>B48, L5