1. Ainley, J. (1999). Doing algebra-type stuff: Emergent algebra in the primary school. In O. Zaslavsky (Ed.), Proceedings of the twenty third annual conference of the International Group for the Psychology of Mathematics, Haifa, Israel.
2. Ainley, J., Bills, L., & Wilson, K. (2003). Designing tasks for purposeful algebra. Proceedings of the third conference of the European Society for Research in Mathematics Education, Bellaria, Italy.
3. Artigue, M. (2002). Learning mathematics in a CAS environment: The genesis of a reflection about instrumentation and the dialectics between technical and conceptual work. International Journal of Computers for Mathematical Learning, 7, 245–274.
4. Arzarello, F., Bazzini, L., & Chiappini, G. (2001). A model for analysing algebraic processes of thinking. In R. Sutherland, T. Assude, A. Bell, & R. Lins (Eds.), Perspectives on school algebra (Vol. 22, pp. 61–81). Dordrecht: Kluwer.
5. Baker, J., & Sugden, S. (2003). Spreadsheets in Education –The First 25 Years. Spreadsheets in Education (eJSiE): Vol. 1–1, Article 2.