Falco, Marsha (1988). Set^{R}: The family game of visual perception. Fountain Hills,
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A. Quinn, R. Koca, F. Weening (1999, December). Developing mathematical
reasoning using attribute games. Mathematics Teacher, 768-775. A superbarticle with examples of student work and extension questions. Available athttp://www.setgame.com/set/article_nctm.htm.