Guy Richard K. <br/><br/>
Unsolved Problems In Number Theory 
/ by Richard K.Guy 
 - New York  Springer Verlag  1981 
 - 161p. 
<br/><br/><label>ISBN: </label>0387905936 
<br/><br/><label>Dewey Class. No.: </label>510.76  / GUY/U