Petakos, Kyriakos. “Comparing Fractions at the Age of 11 through the Use of the Zone of Proximal Development”. EDiMaST: Experiences of Teaching with Mathematics, Sciences and Technology 2, no. 2 (February 25, 2017). Accessed March 28, 2024. https://www.edimast.it/index.php/edimast/article/view/37.