Laine, A., M. Ahtee, L. Näveri, E. Pehkonen, P. P. Koivisto, and L. Tuohilampi. “Collective Emotional Atmosphere in Mathematics Lesson Based on Finnish Fifth graders’ Drawings”. LUMAT: International Journal on Math, Science and Technology Education, vol. 3, no. 1, Feb. 2015, pp. 87-100, doi:10.31129/lumat.v3i1.1053.