@article{HawkingCBG01,
  author = {David Hawking and Nick Craswell and Peter Bailey and Kathleen Griffiths},
  title = {Measuring search engine quality},
  journal = {Information Retrieval},
  year = {2001},
  volume = {4},
  number = {1},
  pages = {33--59},
  note = {\url{http://david-hawking.net/pubs/hawking_ir01.pdf}}
}