@inproceedings{evans-1997-approximating,
    title = "Approximating Context-Free Grammars with a Finite-State Calculus",
    author = "Evans, Edmund Grimley",
    booktitle = "35th Annual Meeting of the Association for Computational Linguistics and 8th Conference of the {E}uropean Chapter of the Association for Computational Linguistics",
    month = jul,
    year = "1997",
    address = "Madrid, Spain",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/Add-Cong-Liu-Florida-Atlantic-University-author-id/P97-1058/",
    doi = "10.3115/976909.979675",
    pages = "452--459"
}