@inproceedings{ijcai1977p67,
  title     = {Multiple Representations of Knowledge in a Mechanics Problem-Solver},
  author    = {de Kleer, Johan},
  booktitle = {Proceedings of the Fifth International Joint Conference on
               Artificial Intelligence, {IJCAI-77}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Raj Reddy},
  pages     = {299--303},
  year      = {1977},
  note      = {Representation of Knowledge},
  url       = {https://ijcai.org/proceedings/1977/67},
}