@article{michelene1981,
  title={Categorization and Representation of Physics Problems by Experts and Novices*},
  author={T. H. Michelene and Paul J. Feltovich and Robert Glaser},
  year={1981},
  journal={Cognitive Science},
  doi={10.1207/s15516709cog0502_2},
  url={https://doi.org/10.1207/s15516709cog0502_2}
}