Knopp, Konrad. <br/><br/>
Problem Book in the theory of Functions /  

 - 1st ed /  
 - New York 19 :   Dover Publications Inc, ,   1982 
 - p.138 :  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B39  / H8.2