Blomhøj, Morten, and Paola Valero. “Vanskeligheder i/Med matematiklæring – Behov for øget Forskning”. NOMAD Nordic Studies in Mathematics Education 11, no. 4 (December 10, 2006): 1–6. Accessed January 9, 2025. https://tidsskrift.dk/NOMAD/article/view/147994.