Abstract
Steffe, L. P. (1990). Inconsistencies and cognitive conflict: A constructivist's view. Focus on learning problems in mathematics, 12, 99-109. van Hiele, P. M. (1986). Structure and insight. Orlando: Academic Press. von Glasersfeld, E. (1991). Abstraction, re-presentation, and reflection: An interpretation of experience and Piaget's approach. In L. P. Steffe (Ed.), Epistemological foundations of mathematical experience (pp. 45-67). New York: Springer-Verlag.
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