@inproceedings{ijcai1971p56,
  title     = {On the Problems of Time, Retrieval of Temporal Relations, Causality, and Co-Existence},
  author    = {Findler, Nicholas V. and Chen, David},
  booktitle = {Proceedings of the Second International Joint Conference on
               Artificial Intelligence, {IJCAI-71}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {D.C. Cooper},
  pages     = {531--544},
  year      = {1971},
  url       = {https://ijcai.org/proceedings/1971/56},
}