@BOOK{ Book!D - 77776925,
AUTHOR = "Shkharskil,David Oskarovich",
TITLE = "The USSR olympiad problem book; selected peoblems and theorems of elementary mathematics",
LIBRARY= "کتابخانه مرکزی و مرکز اطلاع رسانی دانشگاه فردوسی مشهد",
SUBJECT = "Problems, exercises, etc ، Mathematics",
URL = "/book/77776925/The-USSR-olympiad-problem-book-selected-peoblems/"}