BJARNADÓTTIR, Kristín. Tölur og mengi – Numbers and sets. A New Math textbook in Iceland in the 1960s. NOMAD Nordic Studies in Mathematics Education, [S. l.], v. 20, n. 3-4, p. 11–33, 2015. DOI: 10.7146/nomad.v20i3-4.148689. Disponível em: https://tidsskrift.dk/NOMAD/article/view/148689. Acesso em: 6 dec. 2025.