@inproceedings{ijcai1997p49,
  title     = {Use of Abstraction and Complexity Levels in Intelligent Educational System Design},
  author    = {Lelouche, Ruddy and Morin, Jean-François},
  booktitle = {Proceedings of the Fifteenth International Joint Conference on
               Artificial Intelligence, {IJCAI-97}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Martha E. Pollack},
  pages     = {329--333},
  year      = {1997},
  note      = {Computer-aided Education},
  url       = {https://ijcai.org/proceedings/1997/49},
}