@inproceedings{ijcai1991p72,
  title     = {A Skeptic's Menagerie: Conflictors, Preemptors, Reinstaters, and Zombies in Nonrnonotonic Inheritance},
  author    = {Touretzky, David S. and Thomason, Richmond H. and Horty, John F.},
  booktitle = {Proceedings of the Twelfth International Joint Conference on
               Artificial Intelligence, {IJCAI-91}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {John Mylopoulos and Ray Reiter},
  pages     = {478--484},
  year      = {1991},
  month     = {8},
  note      = {Knowledge Representation},
  url       = {https://ijcai.org/proceedings/1991/72},
}