JOHANSSON, Bengt. Matematikdidaktik – nordiskt samarbete i historisk belysning. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 1, n. 1, p. 55–61, 1993. DOI: 10.7146/nomad.v1i1.144989. Disponível em: https://tidsskrift.dk/NOMAD/article/view/144989. Acesso em: 7 dec. 2025.