@article{han2005,
  title={Case-based tutoring systems for procedural problem solving on the www},
  author={Seokmin Han and Sangmin Lee and Geun‐Sik Jo},
  year={2005},
  journal={Expert Systems with Applications},
  doi={10.1016/j.eswa.2005.04.026},
  url={https://doi.org/10.1016/j.eswa.2005.04.026}
}