@unpublished{Voorhees:draft,
  added-at = {2007-12-14T02:47:49.000+0100},
  author = {Voorhees, Ellen M.},
  biburl = {http://www.bibsonomy.org/bibtex/26fe5b94948819e09070e3577366f3095/diego_ma},
  interhash = {ab89b8f85fc84f02c21001ee4d096b61},
  intrahash = {6fe5b94948819e09070e3577366f3095},
  keywords = {inf_retrieval answer_extraction},
  note = {Draft},
  timestamp = {2007-12-14T02:47:49.000+0100},
  title = {Overview of the {TREC} 2001 Question Answering Track},
  url = {http://trec.nist.gov/trec10/t10_notebook.html},
  year = 2002
}