@inproceedings{Piwowarski/etal:10,
  author={Piwowarski, Benjamin and Frommholz, Ingo and Moshfeghi, Yashar and Lalmas, Mounia and van Rijsbergen, Keith},
  title={Filtering documents with subspaces},
  booktitle={Proceedings of the 32nd European Conference on Information Retrieval ({ECIR} 2010)},
  year=2010
}