@Inproceedings{sen2006tagging,
  author = {Sen, Shilad and Lam, Shyong K. and Rashid, Al Mamunur and Cosley, Dan and Frankowski, Dan and Osterhouse, Jeremy and Harper, F. Maxwell and Riedl, John},
  title  = {tagging, communities, vocabulary, evolution},

  year   = {2006},
  number = {},
  url    = {http://portal.acm.org/citation.cfm?id=1180904},
  doi = {http://doi.acm.org/10.1145/1180875.1180904},
  const  = {\ text}
}
@Inproceedings{1180904,
  author = {Sen, Shilad and Lam, Shyong K. and Rashid, Al Mamunur and Cosley, Dan and Frankowski, Dan and Osterhouse, Jeremy and Harper, F. Maxwell and Riedl, John},
  title  = {tagging, communities, vocabulary, evolution},

  year   = {2006},
  number = {},
  url    = {http://portal.acm.org/citation.cfm?id=1180904},
  doi = {http://doi.acm.org/10.1145/1180875.1180904},
  const  = {\ text}
}