@inproceedings{joshi-1987-unification,
    title = "Unification and Some New Grammatical Formalisms",
    author = "Joshi, Aravind K.",
    editor = "Wilks, Yorick",
    booktitle = "Theoretical Issues in Natural Language Processing 3",
    year = "1987",
    url = "https://preview.aclanthology.org/Author-Pages-WenzhengZhang-ZhengyanShi-ShuYang/T87-1011/"
}