1. Abtahi, Y. (2014). Who/what is the more knowledgeable other? For the Learning of Mathematics, 34(3), 14–15.
2. Abtahi, Y. (2015). The zone of proximal development and the affordances of the mathematical tools. In K. Beswick, T. Muir, & J. Wells (Eds.), Proceedings of the 39th Conference of the International Group for the Psychology of Mathematics Education (Vol. 1, pp. 1-8). Hobart: PME.
3. Abtahi, Y. (2016). Things kids think with: The role of the physical properties of mathematical tools in children’s learning in the context of addition of fractions (Unpublished doctoral dissertation). University of Ottawa, Ottawa.
4. Davydov, V. V. (1988). Problems of developmental teaching. Soviet Education, 30, 6–97.
5. Duckworth, E. (1972). The having of wonderful ideas. Harvard Educational Review, 42(2), 217–231.