@conference{157471,
  author = {Ellen Voorhees},
  title = {Overview of the TREC 2001 Question Answering Track},
  year = {2002},
  month = {2002-04-01},
  publisher = {Included in NIST SP 500-250, The Tenth Text Retrieval Conference, TREC 2001, CA},
  url = {https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=51059},
  language = {en},
}