GJONE, G. Bokomtale. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 7, n. 2, p. 58, 1999. DOI: 10.7146/nomad.v7i2.146663. Disponível em: https://tidsskrift.dk/NOMAD/article/view/146663. Acesso em: 9 jan. 2025.