@inproceedings{rapp-2009-backtranslation,
    title = "The Backtranslation Score: Automatic {MT} Evalution at the Sentence Level without Reference Translations",
    author = "Rapp, Reinhard",
    editor = "Su, Keh-Yih  and
      Su, Jian  and
      Wiebe, Janyce  and
      Li, Haizhou",
    booktitle = "Proceedings of the {ACL}-{IJCNLP} 2009 Conference Short Papers",
    month = aug,
    year = "2009",
    address = "Suntec, Singapore",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/fix-sig-urls/P09-2034/",
    pages = "133--136"
}