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The IMO Compendium( A Collection of Problems Suggested for the different advances, 1959-2004) - Dusan Djukic, Vladimir Jankovic, Ivan Matic, Nikola Petrovic. Five Hundred Mathematical Challenges - Edward J. The USSR diet Problem Book( Selected Problems and Theorems of Elementary Mathematics) - D. The William Lowell Putnam Mathematical Competition( Problems and Solutions 1965-1984)( three Articles) - paper 1: A. Kedlaya, Bjorn Poonen, Ravi Vakil. International Mathematics TOURNAMENT OF THE TOWNS( Questions interdependence; Solutions) -( five Studies) - Peter J. Mathematical Problems and Proofs( Combinatorics, Number Theory and Geometry) - Branislav Kisacanin. 360 Problems for Mathematical Contests - Titu Andreescu, Dorin Andrica.