@inproceedings{humphreys-etal-1997-event,
    title = "Event coreference for information extraction",
    author = "Humphreys, Kevin  and
      Gaizauskas, Robert  and
      Azzam, Saliha",
    booktitle = "Operational Factors in Practical, Robust Anaphora Resolution for Unrestricted Texts",
    year = "1997",
    url = "https://aclanthology.org/W97-1311/"
}