@inproceedings{ijcai1997p75,
  title     = {Qualitative Reasoning about Perception and Belief},
  author    = {del Val, Alvaro and II, Pedrito Maynard-Reid and Shoham, Yoav},
  booktitle = {Proceedings of the Fifteenth International Joint Conference on
               Artificial Intelligence, {IJCAI-97}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Martha E. Pollack},
  pages     = {508--512},
  year      = {1997},
  note      = {Diagnosis and Qualitative Reasoning},
  url       = {https://ijcai.org/proceedings/1997/75},
}