Welzel, M. (1999): A Study on Factors Determining the Difficulty and Interestingness of Physics Problems.

Welzel, M. (1999). A Study on Factors Determining the Difficulty and Interestingness of Physics Problems.. In M. Komorek et al.: . Research in Science Education: Past, Present, and Future. Proceedings of the Second International Conference of the European Science Education Research Association (E.S.E.R.A.), Vol. 2 (S. 369–371). Kiel: IPN.@inproceedings{welzel1999, title={A Study on Factors Determining the Difficulty and Interestingness of Physics Problems.}, author={Manuela Welzel}, year={1999}, editor={Komorek, M. et al.}, booktitle={. Research in Science Education: Past, Present, and Future. Proceedings of the Second International Conference of the European Science Education Research Association (E.S.E.R.A.), Vol. 2}, location={Kiel}, publisher={IPN}, pages={369--371} }