Lorch, Edgar R. (Edgar Raymond), 1907- <br/><br/>
Spectral theory/ 
Edgar Raymond Lorch 
 - New York:  Oxford University Press,  1962 
 - 158 p. ;   22 cm. 
 - University texts in the mathematical sciences. .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Spectral theory (Mathematics).