@techreport{Heymann2006,
  abstract = {Collaborative tagging systems---systems where many casual users annotate objects with free-form strings (tags) of their choosing---have recently emerged as a powerful way to label and organize large collections of data. During our recent investigation into these types of systems, we discovered a simple but remarkably effective algorithm for converting a large corpus of tags annotating objects in a tagging system into a navigable hierarchical taxonomy of tags. We first discuss the algorithm and then present a preliminary model to explain why it is so effective in these types of systems.},
  added-at = {2009-02-25T13:24:39.000+0100},
  author = {Heymann, P. and Garcia-Molina, H.},
  biburl = {http://www.bibsonomy.org/bibtex/2f96e02d0c7f981abf76431a55533708b/chriskoerner},
  citeulike-article-id = {739394},
  institution = {Computer Science Department},
  interhash = {d77846b40aadb0e25233cabf905bb93e},
  intrahash = {f96e02d0c7f981abf76431a55533708b},
  keywords = {networks tags taxonomies},
  month = {April},
  number = {2006-10},
  priority = {3},
  school = {Standford University},
  timestamp = {2009-02-25T13:24:39.000+0100},
  title = {Collaborative Creation of Communal Hierarchical Taxonomies in Social Tagging Systems},
  url = {http://dbpubs.stanford.edu:8090/pub/2006-10},
  year = 2006
}