OWENS, K. Recent research and a critique of theories of early geometry learning: the case of the angle concept. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 4, n. 2-3, p. 85–105, 1996. DOI: 10.7146/nomad.v4i2-3.146429. Disponível em: https://tidsskrift.dk/NOMAD/article/view/146429. Acesso em: 9 jan. 2025.