@inproceedings{heesch-04a,
   author = {D Heesch and S R\"{u}ger},
   title = "NNk networks for content-based image retrieval",
   booktitle = "Proc European Conf Information Retrieval",
   location = "Sunderland, UK",
   publisher = "LNCS 2997, Springer",
   pages = "253--266",
   year = "2004"
  }