@inproceedings{ijcai1985p97,
  title     = {A Model-Theoretic Analysis of Monotonic Knowledge},
  author    = {Vardi, Moshe Y.},
  booktitle = {Proceedings of the Ninth International Joint Conference on
               Artificial Intelligence, {IJCAI-85}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Aravind Joshi},
  pages     = {509--511},
  year      = {1985},
  note      = {Knowledge Representation},
  url       = {https://ijcai.org/proceedings/1985/97},
}