PERSSON, P.-E. Handheld calculators as tools for students’ learning of algebra. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 14, n. 2, p. 49–77, 2009. DOI: 10.7146/nomad.v14i2.148178. Disponível em: https://tidsskrift.dk/NOMAD/article/view/148178. Acesso em: 9 jan. 2025.