@Article{tagrecomfolk,
  author = {Jäschke, Robert and Marinho, Leandro and Hotho, Andreas and Schmidt-Thieme, Lars and Stumme, Gerd},
  title  = {Tag Recommendations in Folksonomies},

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

  const  = {\ text}
}
@Techreport{citeulike:739394,
  author = {Heymann, Paul and Garcia-Molina, Hector},
  title  = {Collaborative Creation of Communal Hierarchical Taxonomies in Social Tagging Systems},

  year   = {2006},
  number = {2006-10},
  url    = {http://dbpubs.stanford.edu:8090/pub/2006-10},

  const  = {\ text}
}
@Article{golder2005,
  author = {Golder, Scott and Huberman, Bernardo A.},
  title  = {The Structure of Collaborative Tagging Systems},

  year   = {2005},
  number = {},
  url    = {http://www.citebase.org/abstract?id=oai:arXiv.org:cs/0508082},

  const  = {\ text}
}