@inproceedings{bar-hillel-1952-operational,
    title = "Operational grammar",
    author = "Bar-Hillel, Yehoshua",
    booktitle = "Proceedings of the Conference on Mechanical Translation",
    month = "17-20 " # jun,
    year = "1952",
    address = "Massachusetts Institute of Technology",
    url = "https://aclanthology.org/1952.earlymt-1.14/"
}