Jaegers, D., D. Lafontaine, and A. Fagnant. “How Teachers Can Promote Co-Regulation and Co-Construction of a Skilled Approach in Mathematical Problem Solving at the End of Primary Education”. Swiss Journal of Educational Research, vol. 38, no. 3, Dec. 2012, pp. 569-90, doi:10.24452/sjer.38.3.4994.