@article{johnson-2002-squibs,
    title = "Squibs and Discussions: The {DOP} Estimation Method is Biased and Inconsistent",
    author = "Johnson, Mark",
    journal = "Computational Linguistics",
    volume = "28",
    number = "1",
    year = "2002",
    address = "Cambridge, MA",
    publisher = "MIT Press",
    url = "https://preview.aclanthology.org/landing_page/J02-1005/",
    doi = "10.1162/089120102317341783",
    pages = "71--76"
}