Heikkinen, Henna, Peter Hästö, Vuokko Kangas, and Marko Leinonen. “Promoting Exploratory Teaching in Mathematics: A Design Experiment on a CPD Course for Teachers”. LUMAT: International Journal on Math, Science and Technology Education 3, no. 6 (October 30, 2015): 905–924. Accessed April 24, 2024. https://journals.helsinki.fi/lumat/article/view/1007.