@inproceedings{xiang-etal-2013-enlisting,
    title = "Enlisting the Ghost: Modeling Empty Categories for Machine Translation",
    author = "Xiang, Bing  and
      Luo, Xiaoqiang  and
      Zhou, Bowen",
    editor = "Schuetze, Hinrich  and
      Fung, Pascale  and
      Poesio, Massimo",
    booktitle = "Proceedings of the 51st Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers)",
    month = aug,
    year = "2013",
    address = "Sofia, Bulgaria",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/P13-1081/",
    pages = "822--831"
}