@article{2004-Grootjen-ConceptualQE,
  author		= "Grootjen, F.A. and Weide, Th.P. van der",
  title			= "{Conceptual Query Expansion}",
  journal		= "Data and Knowledge Engineering",
  number		= "2",
  volume		= "56",
  month			= "februari",
  institution		= "Institute for Information and Computing Sciences, Radboud University Nijmegen",
  year			= "2006",
  code			= "icis.NIII-R0406",
  research_group	= "iris",
  pages			= "174--193",
  class			= "Journal"
}