@article{chi-1999-statistical,
    title = "Statistical Properties of Probabilistic Context-Free Grammars",
    author = "Chi, Zhiyi",
    editor = "Hirschberg, Julia",
    journal = "Computational Linguistics",
    volume = "25",
    number = "1",
    year = "1999",
    address = "Cambridge, MA",
    publisher = "MIT Press",
    url = "https://preview.aclanthology.org/fix-sig-urls/J99-1004/",
    pages = "131--160"
}