@inproceedings{guthrie-etal-1990-content,
    title = "Is there content in empty heads?",
    author = "Guthrie, Louise  and
      Slator, Brian M.  and
      Wilks, Yorick  and
      Bruce, Rebecca",
    booktitle = "{COLING} 1990 Volume 3: Papers presented to the 13th International Conference on Computational Linguistics",
    year = "1990",
    url = "https://aclanthology.org/C90-3025/"
}