Aunio, Pirjo, Riikka Mononen, Anu Laine, Geerdina van der Aalsvoort, Carla Compagnie, Annemie Desoete, Evelyn Kroesbergen, Maria Chiara Passolunghi, Martin van Schaik, Anna Tapola, and Tjarda de Wit. 2015. “Mathematical Learning Difficulties – Snapshots of Current European Research”. LUMAT: International Journal on Math, Science and Technology Education 3 (5):647-74. https://doi.org/10.31129/lumat.v3i5.1011.