@inproceedings{ijcai1989p188,
  title     = {Using Global Properties for Qualitative Reasoning: A Qualitative System Theory},
  author    = {Ishida, Yoshiteru},
  booktitle = {Proceedings of the Eleventh International Joint Conference on
               Artificial Intelligence, {IJCAI-89}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {N. S. Sridharan},
  pages     = {1174--1178},
  year      = {1989},
  month     = {8},
  note      = {Knowledge Representation},
  url       = {https://ijcai.org/proceedings/1989/188},
}