@Article{leydesdorff2012alternatives,
  author = {Leydesdorff, Loet},
  title  = {Alternatives to the Journal Impact Factor: I3 and the Top-10% (or   Top-25%?) of the Most-Highly Cited Papers},
  journal = {Digital Libraries},
  year   = {2012},
  number = {},
  url    = {http://arxiv.org/abs/1201.4638},

  const  = {\ text}
}
@Misc{leydesdorff2010semantic,
  author = {Leydesdorff, Loet and Welbers, Kasper},
  title  = {The semantic mapping of words and co-words in contexts},

  year   = {2010},
  number = {},
  url    = {http://arxiv.org/abs/1011.5209},

  const  = {\ text}
}