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