Levinson, Norman <br/><br/>
Gap and density theorems   
by Norman Levinson 
 - USA  American mathematical society  1940 
 - viii,246p. 
 - American Mathematical Society Colloquium Publication  Vol 47 .
<br/><br/><label>ISBN: </label>082181026X 
<br/><br/><label>Dewey Class. No.: </label>515.7  / N40