@ARTICLE{Li:Cryptanalysis:PLA2008a,
  author =       {David Arroyo and Gonzalo Alvarez and Shujun Li and Chengqing Li and Juana Nunez},
  title =        {Cryptanalysis of a discrete-time synchronous chaotic encryption system},
  journal =      {Physics Letters A},
  year =         {2008},
  volume =       {372},
  number =       {7},
  pages =        {1034-1039},
  doi =          {10.1016/j.physleta.2007.08.066},
  note =         {preprint available online at \url{http://www.hooklee.com/pub.html}},
}