Mathematical Olympiads 1998-1999: Problems and Solutions from Around the World
par: Titu Andreescu, Zuming Feng
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Mathematical Olympiads, 2000-2001: Problems and Solutions from Around the World
by: Titu Andreescu, Zuming Feng ,Jr. George Lee
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Best Problems From Around the World - Mathematical Olympiads
by: Cao Minh Quang
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The IMO Compendium: A Collection of Problems Suggested for The International Mathematical Olympiads: 1959-2004
by: Dusan Djukic, Vladimir Z. Jankovic, Ivan Matic, Nikola Petrovic
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360 Problems for Mathematical Contests
by: Titu Andreescu, Dorin Andrica
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The USSR Olympiad Problem Book
by: D. O. Shklarsky, N. N. Chentzov, I. M. Yaglom
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