Andreescu, Titu  . <br/><br/>
Mathematical olympiad challenges /  
by Titu Andreescu, Razvan Gelca. 
 - 2nd ed /  
 - New Delhi :   Springer (India) Pvt. Ltd. ,   2009 
 - xvii, 283p :  
<br/><br/><label>ISBN: </label>978-81-322-1485-4 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics
<br/><br/><label>Dewey Class. No.: </label>B  / P9;4