Randolph Philipp, "The Many Uses of Algebraic Variables," Mathematics Teacher 55 (1992):157-158,
accessed July 13, 2011, www.education.indiana.edu
Arthur T. Baroody and Herbert P. Ginsburg, "The Effect of Instruction on Children's Understanding of
the Equals Sign," The Elementary School Journal 84:2 (1983), 200 (http://www.jstor.org)
Nicole M. McNeil, et al. "Middle-School Students' Understanding of the Equal Sign: The Book They Can't
Read Can't Help," Cognition and Instruction 24:3 (2006):371, accessed July 12, 2011,
www.nd.edu/~nmcneiletal106.pdf
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