1. Ainley, J. (1996). Purposeful contexts for formal notation in a spreadsheet environment. Journal of Mathematical Behavior, 15, 405–422.
2. Arcavi, A., & Hadas, N. (2000). Computer mediated learning: An example of an approach. International Journal of Computers for Mathematical Learning, 5, 25–45.
3. Arzarello, F., & Robutti, O. (2001). From body motion to algebra through graphing. In H. Chick, K. Stacey, J. Vincent, & J. Vincent (Eds.), The future of the teaching and learning of algebra (Proceedings of the 12th ICMI Study Conference, pp. 33–40). Melbourne, Australia: The University of Melbourne.
4. Booth, L. R. (1984). Algebra: Children’s strategies and errors. Windsor, UK: NFER-Nelson.
5. Borba, M. C. (1993). Students’ understanding of transformations of functions using multirepresentational software. Unpublished doctoral dissertation, Cornell University, Ithaca, NY.