@inproceedings{Joachims02,
  author = {Joachims, T.},
  booktitle = {\cite{KDD2002}},
  interhash = {c78df69370bbf12636eaa5233b1fba83},
  intrahash = {bee23197127e6b1dfb7a34bab035eee1},
  location = {Helsinki, Finland},
  pages = {133--142},
  title = {Optimizing Search Engines using Clickthrough Data},
  year = 2002
}