@inproceedings{ji-etal-2009-cross,
    title = "Cross-document Event Extraction and Tracking: Task, Evaluation, Techniques and Challenges",
    author = "Ji, Heng  and
      Grishman, Ralph  and
      Chen, Zheng  and
      Gupta, Prashant",
    editor = "Angelova, Galia  and
      Mitkov, Ruslan",
    booktitle = "Proceedings of the International Conference {RANLP}-2009",
    month = sep,
    year = "2009",
    address = "Borovets, Bulgaria",
    publisher = "Association for Computational Linguistics",
    url = "https://preview.aclanthology.org/ingest-emnlp/R09-1032/",
    pages = "166--172"
}