BJÖRKQVIST, Ole. On categories of research in mathematics education. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 10, n. 1, p. 1–2, 2005. DOI: 10.7146/nomad.v10i1.147154. Disponível em: https://tidsskrift.dk/NOMAD/article/view/147154. Acesso em: 6 dec. 2025.