1. Leibniz-Institut für Wissensmedien, Tübingen, Germany; Technische Universität Kaiserslautern, Dept. Physics/Physics Education Research Group, Kaiserslautern, Germany; LEAD Graduate School and Research Network, University of Tübingen, Tübingen, Germany;
2. University of Tübingen, Tübingen, Germany;
3. Technische Universität Kaiserslautern, Dept. Physics/Physics Education Research Group, Kaiserslautern, Germany;
4. Leibniz-Institut für Wissensmedien, Tübingen, Germany; LEAD Graduate School and Research Network, University of Tübingen, Tübingen, Germany; University of Tübingen, Tübingen, Germany;
5. Leibniz Institute for Science and Mathematics Education, Kiel, Germany;