@misc{W2163640453,
  author = {John R. Anderson and Albert T. Corbett and Kenneth R. Koedinger and Ray Pelletier},
  title = {Cognitive Tutors: Lessons Learned},
  year = {1995},
  howpublished = {Journal of the Learning Sciences},
  doi = {https://doi.org/10.1207/s15327809jls0402\_2}
}