BORGERSEN, H. E. Open ended problem solving in geometry revisited. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 9, n. 3, p. 35–66, 2004. DOI: 10.7146/nomad.v9i3.147128. Disponível em: https://tidsskrift.dk/NOMAD/article/view/147128. Acesso em: 12 dec. 2024.