@inproceedings{ijcai1977p91,
  title     = {Informality in Program Specifications},
  author    = {Balzer, Robert and Goldman, Neil M. and Wile, David S.},
  booktitle = {Proceedings of the Fifth International Joint Conference on
               Artificial Intelligence, {IJCAI-77}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Raj Reddy},
  pages     = {389--396},
  year      = {1977},
  note      = {Aids to Programming},
  url       = {https://ijcai.org/proceedings/1977/91},
}