Citation:
Moustaki, F., Psycharis, G., & Kynigos, C. (2009). Making sense of structural aspects of equations by using algebraic-like formalism. In V. Durand-Guerrier, Soury-Lavergne, S., & Arzarello, F. (Eds.), Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education (CERME 6) (pp. 1419-1428). Lyon, France.
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