@Inproceedings{grahl07conceptualKdml,
  author = {Grahl, Miranda and Hotho, Andreas and Stumme, Gerd},
  title  = {Conceptual Clustering of Social Bookmark Sites},

  year   = {2007},
  number = {},
  url    = {http://www.kde.cs.uni-kassel.de/hotho/pub/2007/kdml_recommender_final.pdf},

  const  = {\ text}
}
@Inproceedings{grahl07conceptualKdml,
  author = {Grahl, Miranda and Hotho, Andreas and Stumme, Gerd},
  title  = {Conceptual Clustering of Social Bookmark Sites},

  year   = {2007},
  number = {},
  url    = {http://www.kde.cs.uni-kassel.de/hotho/pub/2007/kdml_recommender_final.pdf},

  const  = {\ text}
}
@Inproceedings{grahl2007clustering,
  author = {Grahl, Miranda and Hotho, Andreas and Stumme, Gerd},
  title  = {Conceptual Clustering of Social Bookmarking Sites},

  year   = {2007},
  number = {},
  url    = {},

  const  = {\ text}
}