@misc{206646,
  author = {Ellen Voorhees},
  title = {Overview of the TREC-9 Question Answering Track},
  year = {2001},
  month = {2001-09-03},
  publisher = {Overview of the TREC-9 Question Answering Track},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=151529},
  language = {en},
}