@book{ BB15892214,
 author = "Vasilʹev, N. B. (Nikolaĭ Borisovich) and Egorov, Andreĭ Aleksandrovich",
 title = "Задачи всесоюзных математических олимпиад",
 publisher = "Бюро квантум",
 year = "2010",
 series = "Библиотечка "Квант"",
 number = "вып. 117, 119",
 URL = "https://ci.nii.ac.jp/ncid/BB15892214"
}
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