Vlachou, R., and E. Avgerinos. “?ult?ple representat?Ons and Development of students’ Self-Confidence on Rational Number”. EDiMaST: Experiences of Teaching With Mathematics, Sciences and Technology, vol. 4, Dec. 2018, pp. 567-86, https://www.edimast.it/index.php/edimast/article/view/59.