@inproceedings{zhu-etal-2008-learning-bigrams,
    title = "Learning Bigrams from Unigrams",
    author = "Zhu, Xiaojin  and
      Goldberg, Andrew B.  and
      Rabbat, Michael  and
      Nowak, Robert",
    editor = "Moore, Johanna D.  and
      Teufel, Simone  and
      Allan, James  and
      Furui, Sadaoki",
    booktitle = "Proceedings of ACL-08: HLT",
    month = jun,
    year = "2008",
    address = "Columbus, Ohio",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/P08-1075/",
    pages = "656--664"
}