@inproceedings{ijcai1971p64,
  title     = {A Model for Functional Reasoning in Design},
  author    = {Freeman, Peter and Newell, Allen},
  booktitle = {Proceedings of the Second International Joint Conference on
               Artificial Intelligence, {IJCAI-71}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {D.C. Cooper},
  pages     = {621--639},
  year      = {1971},
  url       = {https://ijcai.org/proceedings/1971/64},
}