1. Adjiage, R. (2005). Diversité et invariants des problèmes mettant en jeu des rapports [Diversity and invariants of problems involving relations]. Annales De Didactique Et De Sciences Cognitives, 10, 95–129.
2. Behr, M., Harel, G., Post, T., & Lesh, R. (1992). Rational number, ratio, and proportion. In D. Grouws (Ed.), Handbook of research on mathematics teaching and learning (pp. 296–333). Macmillan.
3. Brousseau, G. (1998). Théorie des situations didactiques [Theory of didactic situations]. Éditions La Pensée Sauvage.
4. Carpenter, T., Fennema, E., Franke, M. L., Levi, L., & Empson, S. (1999). Children’s mathematics: Cognitively guided instruction. Heinemann.
5. Copur-Gencturk, Y., Baek, C., & Doleck, T. (2022). A closer look at teachers’ proportional reasoning. International Journal of Science and Mathematics Education, 21(1), 113–129.