@BOOK{ Book!D - 89969783,
AUTHOR = " Titu Andreescu, Ražvan Gelca ; foreword by Mark Saul",
TITLE = "Mathematical Olympiad challenges /",
LIBRARY= "مرکز و کتابخانه مطالعات اسلامی به زبان‌های اروپایی",
SUBJECT = "Mathematics, Problems, exercises, etc",
URL = "/book/89969783/Mathematical-Olympiad-challenges/"}