Koponen, Ismo T, and Tommi Kokkonen. “A Systemic View of the Learning and Differentiation of Scientific concepts:The Case of Electric Current and Voltage Revisited”. Frontline Learning Research 2, no. 3 (July 2, 2014): 140–166. Accessed April 25, 2024. https://journals.sfu.ca/flr/index.php/journal/article/view/120.