Ahl, L., Gunnarsdóttir, G. H., Koljonen, T. and Pálsdóttir, G. (2015) “How teachers interact and use teacher guides in mathematics – cases from Sweden and Iceland”, NOMAD Nordic Studies in Mathematics Education, 20(3-4), pp. 179–197. doi: 10.7146/nomad.v20i3-4.148697.