@misc{153936,
  author = {Ellen Voorhees and Donna Harman},
  title = {The Eleventh Text REtrieval Conference (TREC-11)},
  year = {2003},
  number = {sp500-251},
  month = {2003-05-01},
  publisher = {Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD},
  language = {en},
}