@inproceedings{ijcai2003p212,
  title     = {Indirect and Conditional Sensing in the Event Calculus},
  author    = {Forth, Jeremy},
  booktitle = {Proceedings of the Eighteenth International Joint Conference on
               Artificial Intelligence, {IJCAI-03}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Georg Gottlob},
  pages     = {1396--1396},
  year      = {2003},
  url       = {https://ijcai.org/proceedings/2003/212},
}