@Misc{Rubin2011,
  author = {Rubin, Timothy N. and Chambers, America and Smyth, Padhraic and Steyvers, Mark},
  title  = {Statistical Topic Models for Multi-Label Document Classification},

  year   = {2011},
  number = {},
  url    = {http://arxiv.org/abs/1107.2462},

  const  = {\ text}
}
@Article{carpena:035102,
  author = {Carpena, P. and Bernaola-Galv\'{a}n, P. and Hackenberg, M. and Coronado, A. V. and Oliver, J. L.},
  title  = {Level statistics of words: Finding keywords in literary texts and symbolic sequences},
  journal = {Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)},
  year   = {2009},
  number = {3},
  url    = {http://bioinfo2.ugr.es/TextKeywords/},
  doi = {10.1103/PhysRevE.79.035102},
  const  = {\ text}
}