@inproceedings{huang-etal-2009-investigation,
    title = "Investigation of Question Classifier in Question Answering",
    author = "Huang, Zhiheng  and
      Thint, Marcus  and
      Celikyilmaz, Asli",
    editor = "Koehn, Philipp  and
      Mihalcea, Rada",
    booktitle = "Proceedings of the 2009 Conference on Empirical Methods in Natural Language Processing",
    month = aug,
    year = "2009",
    address = "Singapore",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/D09-1057/",
    pages = "543--550"
}