@Article{wu07,
  author = {Wu, F. and Huberman, B. A.},
  title  = {Novelty and collective attention},
  journal = {Proc. Natl. Acad. Sci. USA},
  year   = {2007},
  number = {45},
  url    = {http://www.pnas.org/cgi/reprint/104/45/17599.pdf},
  doi = {10.1073/pnas.0704916104},
  const  = {\ text}
}
@Article{adamic02zipf,
  author = {Adamic, L. A. and Huberman, B. A.},
  title  = {Zipf's Law and the Internet},
  journal = {Glottometrics},
  year   = {2002},
  number = {},
  url    = {},

  const  = {\ text}
}