@inproceedings{Schwarzkopf+_dmum07,
  author       = {Eric Schwarzkopf and Dominik Heckmann and Dietmar Dengler and Alexander Kr{\"o}ner},
  title        = {Mining the Structure of Tag Spaces for User Modeling},
  booktitle    = {{Proceedings of the UM 2007 workshop on Data Mining for User Modeling (DMUM07)}},
  editor       = {Ryan S.J.d. Baker and Joseph E. Beck and Bettina Berendt and Alexander Kr{\"o}ner and Ernestina Menasalvas and Stephan Weibelzahl},
  pages        = {30--31},
  year         = {2007},
  month        = {June},
  address      = {Corfu, Greece}
  note         = {Extended abstract}
  URL          = {http://www.educationaldatamining.org/UM2007/Schwarzkopf.pdf}}