@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{stumme05conceptual,
  author = {Stumme, Gerd},
  title  = {Conceptual Knowledge Processing (Invited Talk)},

  year   = {2005},
  number = {},
  url    = {http://www.kde.cs.uni-kassel.de/stumme/papers/2005/stumme2005some_slides.pdf},

  const  = {\ text}
}
@Inproceedings{cimiano2004concept,
  author = {Cimiano, Philipp and Hotho, Andreas and Stumme, Gerd and Tane, Julien},
  title  = {Conceptual Knowledge Processing with Formal Concept Analysis and Ontologies},

  year   = {2004},
  number = {},
  url    = {http://www.kde.cs.uni-kassel.de/stumme/papers/2004/cimiano2004concept.pdf},

  const  = {\ text}
}