Yan Song Y. <br/><br/>
Perfect,Amicable and Sociable Numbers A Computational Approach 
/ by Song Y.Yan 
 - Hong Kong  World Scientific  1996 
 - 338p. 
<br/><br/><label>ISBN: </label>9810228473 
<br/><br/><label>Dewey Class. No.: </label>539.725  / YAN/P