Heikkinen, H., Hästö, P., Kangas, V. and Leinonen, M. 2015. Promoting Exploratory Teaching in Mathematics: A Design Experiment on a CPD course for Teachers. LUMAT: International Journal on Math, Science and Technology Education. 3, 6 (Oct. 2015), 905–924. DOI:https://doi.org/10.31129/lumat.v3i6.1007.