Knopp, Konrad. <br/><br/>
Problem Book in the theory of Functions /  
translated by Lipman Bers. 
 - 1st ed /  
 - New York 14 :   Dover Publications Inc.. 
 - p.126,xxx :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B39  / H8.1