BENTLEY, P.-O. Interference of subtraction strategies. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 17, n. 1, p. 55–65, 2012. DOI: 10.7146/nomad.v17i1.148415. Disponível em: https://tidsskrift.dk/NOMAD/article/view/148415. Acesso em: 8 jan. 2025.