[1]
Partanen, A.-M. and Tolvanen, P. 2019. Developing a frame for analysing different meanings of the concept of variable mediated by tasks in elementary-school mathematics textbooks. NOMAD Nordic Studies in Mathematics Education. 24, 3-4 (Nov. 2019), 59–79. DOI:https://doi.org/10.7146/nomad.v24i3-4.149024.