Hardy, G.H.. <br/><br/>
Introduction to the Theory of Numbers /  

 - Fourth Ed. /  
 - London W.1 :   Oxford University Press ,   1988 
 - p.421,xvii :  
<br/><br/><label>ISBN: </label>0-19-442319-0 
<br/><br/><label>Dewey Class. No.: </label>B13  / K0;2