Douglas, Ronald G. <br/><br/>
Banach algebra techniques in operator theory / 
Ronald G. Douglas 
 - New York :  Academic Press,  1972 
 - 216 p. ;  24 cm. 
 - Pure and applied mathematics ;  vol.49 .
<br/><br/><label>ISBN: </label>0122213505 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Operator theory<br/>Banach algebras<br/>Hilbert space