@inproceedings{ijcai1977p120,
  title     = {Unification of Idempotent Functions},
  author    = {Kühner, Stefan and Mathis, Chris and Raulefs, Peter and Siekmann, Jörg H.},
  booktitle = {Proceedings of the Fifth International Joint Conference on
               Artificial Intelligence, {IJCAI-77}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Raj Reddy},
  pages     = {528---1},
  year      = {1977},
  note      = {Theorem Proving},
  url       = {https://ijcai.org/proceedings/1977/120},
}