Hietala, T., Lehtinen, N. and Kokkinen, T. (2019) “Metallit – Metallien jalostuksen opetus peruskoulussa: Metals – Teaching metal refining in basic education”, LUMAT-B: International Journal on Math, Science and Technology Education, 4(1), pp. 155–176. Available at: https://journals-21.hulib.helsinki.fi/lumatb/article/view/1141 (Accessed: 6 July 2025).