@BOOK{ Book!D - 98860479,
AUTHOR = "Titu Andreescu, Ra zvan Gelca ; foreword by Mark Saul",
TITLE = "Mathematical Olympiad challenges",
LIBRARY= "کتابخانه مرکزی دانشگاه ولی عصر(عج) رفسنجان",
SUBJECT = "Mathematics--Problems, exercises, etc",
URL = "/book/98860479/Mathematical-Olympiad-challenges/"}