Ahtee, M., Pehkonen, E., Laine, A., Näveri, L., Hannula, M. S., & Tikkanen, P. (2016). Developing a method to determine teachers’ and pupils’ activities during a mathematics lesson. Teaching Mathematics and Computer Science, 14(1), 25-43. https://doi.org/10.5485/TMCS.2016.0414