@inproceedings{ijcai1987p81,
  title     = {Tractable Meta-Reasoning in Propositional Logics of Belief},
  author    = {Lakemeyer, Gerhard},
  booktitle = {Proceedings of the Tenth International Joint Conference on
               Artificial Intelligence, {IJCAI-87}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {John McDermott},
  pages     = {402--408},
  year      = {1987},
  note      = {Knowledge Representation},
  url       = {https://ijcai.org/proceedings/1987/81},
}