@article{pullum-1989-book,
    title = "Book Reviews: An Introduction to Formal Language Theory",
    author = "Pullum, Geoffrey K.",
    journal = "Computational Linguistics",
    volume = "15",
    number = "4",
    year = "1989",
    url = "https://preview.aclanthology.org/Add-Cong-Liu-Florida-Atlantic-University-author-id/J89-4004/"
}