A.M.Yaglomand I.M.Yaglom <br/><br/>
Challenging Mathematical problemsWith Elementary Solutions Volume I: 

 - USA  Dover Publications INC.  1987 
 - Viii,231 
<br/><br/><label>ISBN: </label>0-486-65537-7 
<br/><br/><label>Dewey Class. No.: </label>511.6  / YAG