@inproceedings{grahl07conceptualKdml,
  author = {Grahl, Miranda and Hotho, Andreas and Stumme, Gerd},
  title = {Conceptual Clustering of Social Bookmark Sites},
  booktitle = {Workshop Proceedings of Lernen -- Wissensentdeckung -- Adaptivität (LWA 2007)},
  publisher = {Martin-Luther-Universität Halle-Wittenberg},
  year = {2007},
  pages = {50-54},
  url = {http://www.kde.cs.uni-kassel.de/hotho/pub/2007/kdml_recommender_final.pdf}
}

@inproceedings{stumme05conceptual,
  author = {Stumme, Gerd},
  title = {Conceptual Knowledge Processing (Invited Talk)},
  booktitle = {Ontologies-based techniques for DataBases and Information Systems},
  year = {2005},
  pages = {5},
  url = {http://www.kde.cs.uni-kassel.de/stumme/papers/2005/stumme2005some_slides.pdf}
}

@inproceedings{cimiano2004concept,
  author = {Cimiano, Philipp and Hotho, Andreas and Stumme, Gerd and Tane, Julien},
  title = {Conceptual Knowledge Processing with Formal Concept Analysis and Ontologies},
  booktitle = {Concept Lattices},
  publisher = {Springer},
  year = {2004},
  volume = {2961},
  pages = {189-207},
  url = {http://www.kde.cs.uni-kassel.de/stumme/papers/2004/cimiano2004concept.pdf}
}