Andreescu, Titu. , <br/><br/>
Mathematical olympiad challenges / 
Titu Andreescu, Razvan Gelca ; foreword by Mark Saul. 
 - 2nd ed. 
 - vii, 283 pages :  illustrations ;  24 cm. 
<br/><br/><label>ISBN: </label>9780817645281 0817645284 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mathematics --Problems, exercises, etc.
<br/><br/><label>LC Class. No.: </label>QA43   / .A524 2009