@inproceedings{shi-etal-2011-improving,
    title = "Improving the Hierarchical Phrase-Based Translation Model",
    author = "Shi, Xiaodong  and
      Zhu, Xiang  and
      Chen, Yidong",
    booktitle = "Proceedings of Machine Translation Summit XIII: Papers",
    month = sep # " 19-23",
    year = "2011",
    address = "Xiamen, China",
    url = "https://aclanthology.org/2011.mtsummit-papers.43/"
}