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Cajori, F. (1928-29/1993). A history of mathematical notations (two volumes bound as one). New York: Dover Publications.
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Wong, K.M. (1994). Can mathematical rules and procedures be taught without conceptual understanding? Journal of Primary Education, 5(1), 33-41.
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Bromme, R., & Steinbring, H. (1994). Interactive development of subject matter in the mathematics classroom. Educational Studies in Mathematics, 27, 217-248.

Steinbring, H. (1991). The concept of chance in everyday teaching: Aspects of a social epistemology of mathematical knowledge. Educational Studies in Mathematics, 22, 503-522.
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Smith, E.E., & Medin, D.L. (1981). Categories and concepts. Cambridge, MA: Harvard University Press.

Neisser, U. (Ed.). (1987). Concepts and conceptual development: Ecological and intellectual factors in categorization. Cambridge: Cambridge University Press.
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Brenner, M.E., Mayer, R.E., Moseley, B., Brar, T., Durán, R., Reed, B.S., & Webb, D. (1997). Learning by understanding: The role of multiple representations in learning algebra. American Educational Research Journal, 34, 663-689.
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Fodor, J.A. (1981). Representations: Philosophical essays on the foundations of cognitive science. Sussex, UK: The Harvester Press.
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