@inproceedings{ren-etal-2007-improving,
    title = "Improving statistical word alignment with various clues",
    author = "Ren, Dengjun  and
      Wu, Hua  and
      Wang, Haifeng",
    editor = "Maegaard, Bente",
    booktitle = "Proceedings of Machine Translation Summit XI: Papers",
    month = sep # " 10-14",
    year = "2007",
    address = "Copenhagen, Denmark",
    url = "https://aclanthology.org/2007.mtsummit-papers.52/"
}