@inproceedings{friedman-etal-1986-weak,
    title = "The Weak Generative Capacity of Parenthesis-Free Categorial Grammars",
    author = "Friedman, Joyce  and
      Dai, Dawei  and
      Wang, Weiguo",
    booktitle = "Coling 1986 Volume 1: The 11th International Conference on Computational Linguistics",
    year = "1986",
    url = "https://aclanthology.org/C86-1047/"
}