@inproceedings{liao-grishman-2011-acquiring,
    title = "Acquiring Topic Features to improve Event Extraction: in Pre-selected and Balanced Collections",
    author = "Liao, Shasha  and
      Grishman, Ralph",
    editor = "Mitkov, Ruslan  and
      Angelova, Galia",
    booktitle = "Proceedings of the International Conference Recent Advances in Natural Language Processing 2011",
    month = sep,
    year = "2011",
    address = "Hissar, Bulgaria",
    publisher = "Association for Computational Linguistics",
    url = "https://aclanthology.org/R11-1002",
    pages = "9--16",
}