@Inproceedings{heymann2008social,
  author = {Heymann, Paul and Ramage, Daniel and Garcia-Molina, Hector},
  title  = {Social tag prediction},

  year   = {2008},
  number = {},
  url    = {http://portal.acm.org/citation.cfm?id=1390334.1390425},
  doi = {http://doi.acm.org/10.1145/1390334.1390425},
  const  = {\ text}
}
@Article{keyhere,
  author = {Xu, Yanfei and Zhang, Liang and Liu, Wei},
  title  = {Cubic Analysis of Social Bookmarking for Personalized Recommendation},
  journal = {Frontiers of WWW Research and Development - APWeb 2006},
  year   = {2006},
  number = {},
  url    = {http://dx.doi.org/10.1007/11610113_66},

  const  = {\ text}
}