@InProceedings{ji-EtAl:2009:RANLP09,
  author    = {Ji, Heng  and  Grishman, Ralph  and  Chen, Zheng  and  Gupta, Prashant},
  title     = {Cross-document Event Extraction and Tracking: Task, Evaluation, Techniques and Challenges},
  booktitle = {Proceedings of the International Conference RANLP-2009},
  month     = {September},
  year      = {2009},
  address   = {Borovets, Bulgaria},
  publisher = {Association for Computational Linguistics},
  pages     = {166--172},
  url       = {http://www.aclweb.org/anthology/R09-1032}
}