@article{brown-etal-1993-mathematics,
    title = "The Mathematics of Statistical Machine Translation: Parameter Estimation",
    author = "Brown, Peter F.  and
      Della Pietra, Stephen A.  and
      Della Pietra, Vincent J.  and
      Mercer, Robert L.",
    editor = "Hirschberg, Julia",
    journal = "Computational Linguistics",
    volume = "19",
    number = "2",
    year = "1993",
    address = "Cambridge, MA",
    publisher = "MIT Press",
    url = "https://preview.aclanthology.org/fix-sig-urls/J93-2003/",
    pages = "263--311"
}