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lMathematical Circles: Russian Experience by Dmitri Fomin, Sergey Genkin and Ilia V. Itenberg, AMS, 1996
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lSolve This: Math Activities for Students and Clubs by James S. Tanton, 2001
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lOut of the Labyrinth: Setting Mathematics Free by Robert Kaplan and Ellen Kaplan, Oxford University Press, 2006