HELENIUS, Ola; AHL, Linda Marie. Gérard Vergnaud in action. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 27, n. 1, p. 71–80, 2022. DOI: 10.7146/nomad.v27i1.149185. Disponível em: https://tidsskrift.dk/NOMAD/article/view/149185. Acesso em: 16 dec. 2025.