@inproceedings{ijcai1975p70,
  title     = {Negation And Focus in Man - Machine Communication},
  author    = {Sgall, Petr and Hajicová, Eva},
  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     = {443--447},
  year      = {1975},
  note      = {Natural Language Understanding},
  url       = {https://ijcai.org/proceedings/1975/70},
}