1. Barrouillet, P., & Camos, V. (2003). Savoirs, savoir-faire arithmétiques, et leurs déficiences. [Knowledge, arithmetic know-how, and their deficiencies]. In M. Kail & P. M. Fayol (Eds.), Les sciences cognitives et l’école. La question des apprentissages (pp. 307–351). Paris: PUF.
2. Bednarz, N., Kieran, C., & Lee, L. (1996). Approaches to algebra: perspectives for research and teaching mathematics. Boston: Kluwer Academic Publishers.
3. Bikner-Ahsbahs, A.-A., & Janßen, T. (2013). Emergent tasks—spontaneous design supporting in-depth learning. In C. Margolinas (Ed.), Task design in mathematics education. Proceedings of the International Commission on Mathematical Instruction Study 22 (pp. 153–162). Oxford, UK.
4. Brousseau, G. (1988). Théorie des situations didactiques. [Theory of didactical situations]. Grenoble: La Pensée Sauvage.
5. Cai, J., & Knuth, E. J. (2011). Early algebraization: a global dialogue from multiple perspectives. New York: Springer .