@Article{yan2011spread,
  author = {Yan, Koon-Kiu and Gerstein, Mark},
  title  = {The Spread of Scientific Information: Insights from the Web Usage Statistics in PLoS Article-Level Metrics},
  journal = {PLoS ONE},
  year   = {2011},
  number = {5},
  url    = {http://dx.doi.org/10.1371%2Fjournal.pone.0019917},
  doi = {10.1371/journal.pone.0019917},
  const  = {\ text}
}
@Article{1742-5468-2007-06-P06010,
  author = {Walker, Dylan and Xie, Huafeng and Yan, Koon-Kiu and Maslov, Sergei},
  title  = {Ranking scientific publications using a model of network traffic},
  journal = {Journal of Statistical Mechanics: Theory and Experiment},
  year   = {2007},
  number = {06},
  url    = {http://stacks.iop.org/1742-5468/2007/i=06/a=P06010},

  const  = {\ text}
}