MERENLUOTO, Kaarina; LEHTINEN, Erno. The quality of conceptual change in mathematics – the case of number concept. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 9, n. 2, p. 145–163, 2004. DOI: 10.7146/nomad.v9i2.147124. Disponível em: https://tidsskrift.dk/NOMAD/article/view/147124. Acesso em: 24 dec. 2025.