JOHANSSON , B.; EMANUELSSON, G. Om problemlösning, laborativa material och test. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 3, n. 3, p. 4–6, 1995. DOI: 10.7146/nomad.v3i3.146179. Disponível em: https://tidsskrift.dk/NOMAD/article/view/146179. Acesso em: 9 jan. 2025.