@Misc{citeulike:341233,
  author = {Radicchi, Filippo and Castellano, Claudio and Cecconi, Federico and Loreto, Vittorio and Parisi, Domenico},
  title  = {Defining and identifying communities in networks},

  year   = {2004},
  number = {},
  url    = {http://arxiv.org/abs/cond-mat/0309488},

  const  = {\ text}
}
@Inproceedings{xin2008www,
  author = {Li, Xin and Guo, Lei and Zhao, Yihong E.},
  title  = {Tag-based Social Interest Discovery},

  year   = {2008},
  number = {},
  url    = {http://www2008.org/papers/pdf/p675-liA.pdf},

  const  = {\ text}
}
@Article{cattuto2007,
  author = {Cattuto, C. and Schmitz, C. and Baldassarri, A. and Servedio, V. D. P. and Loreto, V. and Hotho, A. and Grahl, M. and Stumme, G.},
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  journal = {AI Communications},
  year   = {2007},
  number = {4},
  url    = {http://www.kde.cs.uni-kassel.de/hotho/pub/2007/aicomm_2007_folksonomy_clustering.pdf},

  const  = {\ text}
}