CHRISTENSEN, Brian. Overgangsproblemer i matematik. MONA - Matematik- og Naturfagsdidaktik, [S. l.], v. 2021, n. 2, 2021. DOI: 10.7146/mona.v2021i2.126996. Disponível em: https://tidsskrift.dk/mona/article/view/126996. Acesso em: 7 dec. 2025.