@inproceedings{ijcai1977p220,
  title     = {OPS, A Domain-Independent Production System Language},
  author    = {Forgy, Charles and McDermott, John P.},
  booktitle = {Proceedings of the Fifth International Joint Conference on
               Artificial Intelligence, {IJCAI-77}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Raj Reddy},
  pages     = {933--938},
  year      = {1977},
  note      = {Languages and Systems},
  url       = {https://ijcai.org/proceedings/1977/220},
}