@inproceedings{newman-1990-towards,
    title = "Towards Convenient Bi-Directional Grammar Formalisms",
    author = "Newman, P.",
    booktitle = "{COLING} 1990 Volume 2: Papers presented to the 13th International Conference on Computational Linguistics",
    year = "1990",
    url = "https://aclanthology.org/C90-2051/"
}