BORGERSEN, H. E. Open ended problem solving in geometry. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 2, n. 2, p. 6–35, 1994. DOI: 10.7146/nomad.v2i2.146040. Disponível em: https://tidsskrift.dk/NOMAD/article/view/146040. Acesso em: 9 jan. 2025.