Pettersson, Annika, Yvonne Liljekvist, and Jorryt van Bommel. “Studying Concept Elements As a Way to Trace students’ Conceptual Understanding”. NOMAD Nordic Studies in Mathematics Education 24, no. 1 (March 1, 2019): 5–26. Accessed February 10, 2026. https://tidsskrift.dk/NOMAD/article/view/148995.