@inproceedings{ijcai1987p6,
  title     = {Constraints in a Hybrid Knowledge Representation System},
  author    = {Guesgen, Hans W. and Junker, Ulrich and Voß, Angi},
  booktitle = {Proceedings of the Tenth International Joint Conference on
               Artificial Intelligence, {IJCAI-87}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {John McDermott},
  pages     = {30--32},
  year      = {1987},
  note      = {Architectures and Languages},
  url       = {https://ijcai.org/proceedings/1987/6},
}