@Article{santosneto2009individual,
  author = {Santos-Neto, E. and Condon, D. and Andrade, N. and Iamnitchi, A. and Ripeanu, M.},
  title  = {Individual and social behavior in tagging systems},

  year   = {2009},
  number = {},
  url    = {http://scholar.google.de/scholar.bib?q=info:78ozoF5AkegJ:scholar.google.com/&output=citation&hl=de&as_sdt=2000&ct=citation&cd=0},

  const  = {\ text}
}
@Article{santos2009individual,
  author = {Santos-Neto, E. and Condon, D. and Andrade, N. and Iamnitchi, A. and Ripeanu, M.},
  title  = {Individual and social behavior in tagging systems},

  year   = {2009},
  number = {},
  url    = {http://scholar.google.de/scholar.bib?q=info:78ozoF5AkegJ:scholar.google.com/&output=citation&hl=de&as_sdt=2000&ct=citation&cd=0},

  const  = {\ text}
}