@inproceedings{ijcai1975p2,
  title     = {On the Role of Mathematical Language Concept in the Theory of Intelligent Systems},
  author    = {Andréka, Hajnal and Gergely, Tamás and Németi, István},
  booktitle = {Proceedings of the Fourth International Joint Conference on
               Artificial Intelligence, {IJCAI-75}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Patrick Winston and Carl Hewitt},
  pages     = {9--13},
  year      = {1975},
  note      = {Mathematical and Theoretical Aspects of A.I},
  url       = {https://ijcai.org/proceedings/1975/2},
}