Duchi, L., Servant-Miklos, V., Kooij, L. and Noordegraaf-Eelens, L. (2023) “The ‘Sweet Spot’ for Reflection in Problem-oriented Education: Insights From Phenomenographic Action-research”, Journal of Problem Based Learning in Higher Education, 11(1), pp. 1–35. doi: 10.54337/ojs.jpblhe.v11i1.7370.