FIRSOV, V. Mathematics education as theoretical knowledge. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 3, n. 4, p. 7–19, 1995. DOI: 10.7146/nomad.v3i4.146187. Disponível em: https://tidsskrift.dk/NOMAD/article/view/146187. Acesso em: 9 jan. 2025.