Helson, Henry. <br/><br/>
Lectures on invariant subspaces / 
Henry Helson 
 - New York :  Academic Press,  c1964. 
 - xi, 130 p. ;  23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Hilbert space.<br/>Functions.<br/>Invariant subspaces.
<br/><br/><label>Dewey Class. No.: </label>513.82  / HEL 1964