@inproceedings{ijcai2003p159,
  title     = {Belief, Awareness, and Two-Dimensional Logic},
  author    = {Liu, Hu and Ju, Shier},
  booktitle = {Proceedings of the Eighteenth International Joint Conference on
               Artificial Intelligence, {IJCAI-03}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Georg Gottlob},
  year      = {2003},
  url       = {https://ijcai.org/proceedings/2003/159},
}