Lorch, Edgar Raymond. <br/><br/>
Spectral theory / 
Edgar Raymond Lorch 
 - New York :  Oxford University Press,  c1962. 
 - [8], 158 p. ;  22 cm. 
 - University texts in the mathematical sciences .
 - University texts in the mathematical sciences .
<br/><br/> Includes index 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Spectral theory (Mathematics)
<br/><br/><label>Dewey Class. No.: </label>515.7222  / LOS 1962