@BOOK{ Book!D - 101382893,
AUTHOR = "Titu Andreescu, Razvan Gelca; foreword by Mark Saul",
TITLE = "Mathematical Olympiad challenges",
LIBRARY= "کتابخانه پژوهشگاه دانشهای بنیادی",
SUBJECT = "Problems, exercises, etc ، Mathematics",
URL = "/book/101382893/Mathematical-Olympiad-challenges/"}