@article{brown-etal-1992-class,
    title = "Class-Based \textit{n}-gram Models of Natural Language",
    author = "Brown, Peter F.  and
      Della Pietra, Vincent J.  and
      deSouza, Peter V.  and
      Lai, Jenifer C.  and
      Mercer, Robert L.",
    journal = "Computational Linguistics",
    volume = "18",
    number = "4",
    year = "1992",
    url = "https://preview.aclanthology.org/Author-page-Marten-During-lu/J92-4003/",
    pages = "467--480"
}