Viholainen, A., Partanen, M., Piiroinen, J., Asikainen, M.A. and Hirvonen, P.E. 2015. The role of textbooks in Finnish upper secondary school mathematics: theory, examples and exercises. NOMAD Nordic Studies in Mathematics Education. 20, 3-4 (Nov. 2015), 157–178. DOI:https://doi.org/10.7146/nomad.v20i3-4.148696.