@Article{newman2003social,
  author = {Newman, MEJ and Park, J.},
  title  = {Why social networks are different from other types of networks},
  journal = {Physical Review E},
  year   = {2003},
  number = {3},
  url    = {http://scholar.google.de/scholar.bib?q=info:Ep_ADiiiopYJ:scholar.google.com/&output=citation&hl=de&as_sdt=2000&ct=citation&cd=0},

  const  = {\ text}
}