@inproceedings{heafield-etal-2009-machine,
    title = "Machine Translation System Combination with Flexible Word Ordering",
    author = "Heafield, Kenneth  and
      Hanneman, Greg  and
      Lavie, Alon",
    editor = "Callison-Burch, Chris  and
      Koehn, Philipp  and
      Monz, Christof  and
      Schroeder, Josh",
    booktitle = "Proceedings of the Fourth Workshop on Statistical Machine Translation",
    month = mar,
    year = "2009",
    address = "Athens, Greece",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/W09-0408/",
    pages = "56--60"
}